diff --git a/numass-main/src/main/groovy/inr/numass/scripts/FindExIonRatio.groovy b/numass-main/src/main/groovy/inr/numass/scripts/FindExIonRatio.groovy
index 2eea6052..e1fbc9f5 100644
--- a/numass-main/src/main/groovy/inr/numass/scripts/FindExIonRatio.groovy
+++ b/numass-main/src/main/groovy/inr/numass/scripts/FindExIonRatio.groovy
@@ -43,7 +43,7 @@ UnivariateIntegrator integrator = NumassContext.defaultIntegrator;
 
 double border = 13.6;
 
-UnivariateFunction ratioFunction = {e->integrator.integrate(scatterFunction, 0 , e) / integrator.integrate(scatterFunction, e, 100)}
+UnivariateFunction ratioFunction = {e->integrator.integrate(0, e, scatterFunction) / integrator.integrate(e, 100, scatterFunction)}
 
 double ratio = ratioFunction.value(border);
 println "The true excitation to ionization ratio with border energy $border is $ratio";
@@ -83,7 +83,7 @@ UnivariateFunction integral = {double u ->
         return 0d;
     } else {
         UnivariateFunction integrand = {double e -> resolutionValue.value(u-e) * newScatterFunction.value(e)};
-        return integrator.integrate(integrand, 0d, u)
+        return integrator.integrate(0d, u, integrand)
     }
 }
 
diff --git a/numass-main/src/main/groovy/inr/numass/scripts/LossNormCalculation.groovy b/numass-main/src/main/groovy/inr/numass/scripts/LossNormCalculation.groovy
index 78b1264a..afee80a4 100644
--- a/numass-main/src/main/groovy/inr/numass/scripts/LossNormCalculation.groovy
+++ b/numass-main/src/main/groovy/inr/numass/scripts/LossNormCalculation.groovy
@@ -6,9 +6,8 @@
 
 package inr.numass.scripts
 
-import hep.dataforge.maths.integration.GaussRuleIntegrator;
-import hep.dataforge.maths.integration.UnivariateIntegrator;
-import inr.numass.models.LossCalculator;
+import hep.dataforge.maths.integration.GaussRuleIntegrator
+import hep.dataforge.maths.integration.UnivariateIntegrator
 import org.apache.commons.math3.analysis.UnivariateFunction
 
 UnivariateIntegrator integrator = new GaussRuleIntegrator(400);
@@ -42,6 +41,6 @@ UnivariateFunction func = {double eps ->
 
 //caclulating lorentz integral analythically
 double tailNorm = (Math.atan((ionPos - cutoff) * 2d / ionW) + 0.5 * Math.PI) * ionW / 2d;
-final double norm = integrator.integrate(func, 0d, cutoff) + tailNorm;
+final double norm = integrator.integrate(0d, cutoff, func) + tailNorm;
 
 println 1/norm;
\ No newline at end of file
diff --git a/numass-main/src/main/groovy/inr/numass/scripts/LossTailCalculation.groovy b/numass-main/src/main/groovy/inr/numass/scripts/LossTailCalculation.groovy
index 147d00ad..766166ce 100644
--- a/numass-main/src/main/groovy/inr/numass/scripts/LossTailCalculation.groovy
+++ b/numass-main/src/main/groovy/inr/numass/scripts/LossTailCalculation.groovy
@@ -24,11 +24,11 @@ def cutoff = 20d
 UnivariateFunction loss = LossCalculator.getSingleScatterFunction(exPos, ionPos, exW, ionW, exIonRatio);
 
 
-println integrator.integrate(loss,0,600);
-println integrator.integrate(loss,0, cutoff);
-println integrator.integrate(loss,cutoff,600d);
+println integrator.integrate(0, 600, loss);
+println integrator.integrate(0, cutoff, loss);
+println integrator.integrate(cutoff, 600d, loss);
 
-println (integrator.integrate(loss,0,cutoff) + integrator.integrate(loss,cutoff,3000d));
+println (integrator.integrate(0, cutoff, loss) + integrator.integrate(cutoff, 3000d, loss));
 //double tailValue = (Math.atan((ionPos-cutoff)*2d/ionW) + 0.5*Math.PI)*ionW/2;
 //println tailValue
 //println integrator.integrate(loss,0,100);
diff --git a/numass-main/src/main/groovy/inr/numass/scripts/TestExperimentalVariableLossSpectrum.groovy b/numass-main/src/main/groovy/inr/numass/scripts/TestExperimentalVariableLossSpectrum.groovy
index ed3f14c5..3b9790fc 100644
--- a/numass-main/src/main/groovy/inr/numass/scripts/TestExperimentalVariableLossSpectrum.groovy
+++ b/numass-main/src/main/groovy/inr/numass/scripts/TestExperimentalVariableLossSpectrum.groovy
@@ -15,17 +15,14 @@
  */
 package inr.numass.scripts
 
+import hep.dataforge.io.PrintFunction
 import hep.dataforge.maths.integration.UnivariateIntegrator
 import hep.dataforge.plots.data.PlottableXYFunction
 import hep.dataforge.plots.jfreechart.JFreeChartFrame
+import hep.dataforge.stat.fit.ParamSet
 import inr.numass.models.ExperimentalVariableLossSpectrum
 import org.apache.commons.math3.analysis.UnivariateFunction
 
-import inr.numass.Numass
-import hep.dataforge.stat.fit.ParamSet
-import hep.dataforge.io.PrintFunction
-
-
 //double exPos = 12.94
 //double exW = 1.31
 //double ionPos = 14.13
@@ -50,17 +47,17 @@ UnivariateIntegrator integrator = NumassContext.defaultIntegrator
 UnivariateFunction exFunc = lsp.excitation(params.getValue("exPos"), params.getValue("exW"));
 frame.add(PlottableXYFunction.plotFunction("ex", exFunc, 0d, 50d, 500));
 
-println "excitation norm factor " + integrator.integrate(exFunc, 0, 50)
+println "excitation norm factor " + integrator.integrate(0, 50, exFunc)
 
 UnivariateFunction ionFunc = lsp.ionization(params.getValue("ionPos"), params.getValue("ionW"));
 frame.add(PlottableXYFunction.plotFunction("ion",  ionFunc, 0d, 50d, 500));
 
-println "ionization norm factor " + integrator.integrate(ionFunc, 0, 200)
+println "ionization norm factor " + integrator.integrate(0, 200, ionFunc)
 
 UnivariateFunction sumFunc = lsp.singleScatterFunction(params);
 frame.add(PlottableXYFunction.plotFunction("sum",  sumFunc, 0d, 50d, 500));
 
-println "sum norm factor " + integrator.integrate(sumFunc, 0, 100)
+println "sum norm factor " + integrator.integrate(0, 100, sumFunc)
 
 PrintFunction.printFunctionSimple(new PrintWriter(System.out), sumFunc, 0d, 50d, 100)
 
diff --git a/numass-main/src/main/groovy/inr/numass/scripts/temp/FSSEffect.groovy b/numass-main/src/main/groovy/inr/numass/scripts/temp/FSSEffect.groovy
new file mode 100644
index 00000000..161d15e0
--- /dev/null
+++ b/numass-main/src/main/groovy/inr/numass/scripts/temp/FSSEffect.groovy
@@ -0,0 +1,46 @@
+package inr.numass.scripts.temp
+
+import hep.dataforge.context.Context
+import hep.dataforge.context.Global
+import hep.dataforge.grind.Grind
+import hep.dataforge.grind.GrindShell
+import hep.dataforge.grind.helpers.PlotHelper
+import hep.dataforge.meta.Meta
+import hep.dataforge.plots.fx.FXPlotManager
+import hep.dataforge.stat.fit.ParamSet
+import hep.dataforge.utils.MetaMorph
+import inr.numass.NumassPlugin
+import inr.numass.models.sterile.SterileNeutrinoSpectrum
+
+Context ctx = Global.instance()
+ctx.pluginManager().load(FXPlotManager)
+ctx.pluginManager().load(NumassPlugin.class)
+
+
+new GrindShell(ctx).eval {
+    SterileNeutrinoSpectrum sp1 = new SterileNeutrinoSpectrum(context, Meta.empty());
+    SterileNeutrinoSpectrum sp2 = new SterileNeutrinoSpectrum(context, Grind.buildMeta(useFSS: false));
+
+    def params = MetaMorph.morph(ParamSet,
+            Grind.buildMeta("params") {
+                N(value: 6e5, err: 1e5, lower: 0)
+                bkg(value: 2, err: 0.1)
+                E0(value: 18575, err: 0.1)
+                mnu2(value: 0, err: 0.01)
+                msterile2(value: 1000**2, err: 1)
+                U2(value: 0, err: 1e-3)
+                X(value: 0, err: 0.01, lower: 0)
+                trap(value: 0, err: 0.05)
+            }
+    )
+
+
+    def xs = (1..400).collect{18000 + it*2}
+
+    def sp1Points = xs.collect { sp1.value(it, params) }
+    def sp2Points = xs.collect { sp2.value(it, params) }
+
+
+    (plots as PlotHelper).plot(xs,sp1Points,"FSS")
+    (plots as PlotHelper).plot(xs,sp2Points,"noFSS")
+}
\ No newline at end of file
diff --git a/numass-main/src/main/java/inr/numass/models/CustomNBkgSpectrum.java b/numass-main/src/main/java/inr/numass/models/CustomNBkgSpectrum.java
index e2aa23eb..2b148dd2 100644
--- a/numass-main/src/main/java/inr/numass/models/CustomNBkgSpectrum.java
+++ b/numass-main/src/main/java/inr/numass/models/CustomNBkgSpectrum.java
@@ -22,7 +22,7 @@ public class CustomNBkgSpectrum extends NBkgSpectrum {
         UnivariateFunction differentialBkgFunction = NumassUtils.tritiumBackgroundFunction(amplitude);
         UnivariateFunction integralBkgFunction = 
                 (x) -> NumassIntegrator.getDefaultIntegrator()
-                        .integrate(differentialBkgFunction, x, 18580d);
+                        .integrate(x, 18580d, differentialBkgFunction);
         return new CustomNBkgSpectrum(source, integralBkgFunction);
     }
 
diff --git a/numass-main/src/main/java/inr/numass/models/EmpiricalLossSpectrum.java b/numass-main/src/main/java/inr/numass/models/EmpiricalLossSpectrum.java
index a4803a50..6ffe618d 100644
--- a/numass-main/src/main/java/inr/numass/models/EmpiricalLossSpectrum.java
+++ b/numass-main/src/main/java/inr/numass/models/EmpiricalLossSpectrum.java
@@ -65,7 +65,7 @@ public class EmpiricalLossSpectrum extends AbstractParametricFunction {
             return LossCalculator.instance().getLossValue(probs, Ei, Ef);
         };
         UnivariateFunction integrand = (double x) -> transmission.value(x) * lossFunction.value(x, U - shift);
-        return noLossProb * transmission.value(U - shift) + integrator.integrate(integrand, U, eMax);
+        return noLossProb * transmission.value(U - shift) + integrator.integrate(U, eMax, integrand);
     }
 
     @Override
diff --git a/numass-main/src/main/java/inr/numass/models/GunSpectrum.java b/numass-main/src/main/java/inr/numass/models/GunSpectrum.java
index 7a2fde67..8e754b86 100644
--- a/numass-main/src/main/java/inr/numass/models/GunSpectrum.java
+++ b/numass-main/src/main/java/inr/numass/models/GunSpectrum.java
@@ -70,7 +70,7 @@ public class GunSpectrum extends AbstractParametricFunction {
         } else if (pos - cutoff * sigma > U * (1 + resA)) {
             return 0;
         } else {
-            return integrator.integrate(integrand, pos - cutoff * sigma, pos + cutoff * sigma);
+            return integrator.integrate(pos - cutoff * sigma, pos + cutoff * sigma, integrand);
         }
     }
 
@@ -148,7 +148,7 @@ public class GunSpectrum extends AbstractParametricFunction {
         } else if (pos - cutoff * sigma > U * (1 + resA)) {
             return 1;
         } else {
-            return integrator.integrate(integrand, pos - cutoff * sigma, pos + cutoff * sigma);
+            return integrator.integrate(pos - cutoff * sigma, pos + cutoff * sigma, integrand);
         }
 
     }
diff --git a/numass-main/src/main/java/inr/numass/models/LossCalculator.java b/numass-main/src/main/java/inr/numass/models/LossCalculator.java
index 7459de04..3101b989 100644
--- a/numass-main/src/main/java/inr/numass/models/LossCalculator.java
+++ b/numass-main/src/main/java/inr/numass/models/LossCalculator.java
@@ -123,7 +123,7 @@ public class LossCalculator {
         double cutoff = 25d;
         //caclulating lorentz integral analythically
         double tailNorm = (Math.atan((ionPos - cutoff) * 2d / ionW) + 0.5 * Math.PI) * ionW / 2d;
-        final double norm = integrator.integrate(func, 0d, cutoff) + tailNorm;
+        final double norm = integrator.integrate(0d, cutoff, func) + tailNorm;
         return (e) -> func.value(e) / norm;
     }
 
@@ -385,7 +385,7 @@ public class LossCalculator {
                     return 0;
                 }
             };
-            return integrator.integrate(integrand, 5d, margin);
+            return integrator.integrate(5d, margin, integrand);
         };
 
         return FunctionCaching.cacheUnivariateFunction(0, margin, 200, res);
diff --git a/numass-main/src/main/java/inr/numass/models/LossResConvolution.java b/numass-main/src/main/java/inr/numass/models/LossResConvolution.java
index e5b88f54..fe59f326 100644
--- a/numass-main/src/main/java/inr/numass/models/LossResConvolution.java
+++ b/numass-main/src/main/java/inr/numass/models/LossResConvolution.java
@@ -38,7 +38,7 @@ class LossResConvolution implements BivariateFunction {
     public double value(final double Ein, final double U) {
         UnivariateFunction integrand = (double Eout) -> loss.value(Ein, Eout) * res.value(Eout, U);
         //Энергия в принципе не может быть больше начальной и меньше напряжения
-        return NumassIntegrator.getDefaultIntegrator().integrate(integrand, U, Ein);
+        return NumassIntegrator.getDefaultIntegrator().integrate(U, Ein, integrand);
 
     }
 }
diff --git a/numass-main/src/main/java/inr/numass/models/TransmissionConvolution.java b/numass-main/src/main/java/inr/numass/models/TransmissionConvolution.java
index 0398c1d4..b110f9ec 100644
--- a/numass-main/src/main/java/inr/numass/models/TransmissionConvolution.java
+++ b/numass-main/src/main/java/inr/numass/models/TransmissionConvolution.java
@@ -58,7 +58,7 @@ class TransmissionConvolution extends AbstractParametricFunction {
             }
             return trans.value(E, U) * spectrum.derivValue(parName, E, set);
         };
-        return NumassIntegrator.getDefaultIntegrator().integrate(integrand, Math.max(U, min), max + 1d);
+        return NumassIntegrator.getDefaultIntegrator().integrate(Math.max(U, min), max + 1d, integrand);
     }
 
     @Override
@@ -80,6 +80,6 @@ class TransmissionConvolution extends AbstractParametricFunction {
             }
             return trans.value(E, U) * spectrum.value(E, set);
         };
-        return NumassIntegrator.getDefaultIntegrator().integrate(integrand, Math.max(U, min), max + 1d);
+        return NumassIntegrator.getDefaultIntegrator().integrate(Math.max(U, min), max + 1d, integrand);
     }
 }
diff --git a/numass-main/src/main/java/inr/numass/models/VariableLossSpectrum.java b/numass-main/src/main/java/inr/numass/models/VariableLossSpectrum.java
index ed3c7a45..8f083e66 100644
--- a/numass-main/src/main/java/inr/numass/models/VariableLossSpectrum.java
+++ b/numass-main/src/main/java/inr/numass/models/VariableLossSpectrum.java
@@ -106,7 +106,7 @@ public class VariableLossSpectrum extends AbstractParametricFunction {
         } else {
             integrator = NumassIntegrator.getDefaultIntegrator();
         }
-        return noLossProb * transmission.value(U - shift, set) + integrator.integrate(integrand, U, eMax);
+        return noLossProb * transmission.value(U - shift, set) + integrator.integrate(U, eMax, integrand);
     }
 
     public UnivariateFunction singleScatterFunction(ValueProvider set) {
diff --git a/numass-main/src/main/java/inr/numass/models/sterile/SterileNeutrinoSpectrum.java b/numass-main/src/main/java/inr/numass/models/sterile/SterileNeutrinoSpectrum.java
index 92bb2a65..8f71a662 100644
--- a/numass-main/src/main/java/inr/numass/models/sterile/SterileNeutrinoSpectrum.java
+++ b/numass-main/src/main/java/inr/numass/models/sterile/SterileNeutrinoSpectrum.java
@@ -132,7 +132,7 @@ public class SterileNeutrinoSpectrum extends AbstractParametricFunction {
 
         double eMax = set.getDouble("E0") + 5d;
 
-        if (u > eMax) {
+        if (u >= eMax) {
             return 0;
         }
 
@@ -163,7 +163,7 @@ public class SterileNeutrinoSpectrum extends AbstractParametricFunction {
             integrator = NumassIntegrator.getHighDensityIntegrator();
         }
 
-        return integrator.integrate(eIn -> fsSource.value(eIn) * transResFunction.value(eIn, u, set), u, eMax);
+        return integrator.integrate(u, eMax, eIn -> fsSource.value(eIn) * transResFunction.value(eIn, u, set));
     }
 
     private class TransRes extends AbstractParametricBiFunction {
@@ -201,13 +201,13 @@ public class SterileNeutrinoSpectrum extends AbstractParametricFunction {
             UnivariateFunction integrand = (eOut) -> transFunc.value(eIn, eOut, set) * resolution.value(eOut, u, set);
 
             double border = u + 30;
-            double firstPart = NumassIntegrator.getFastInterator().integrate(integrand, u, Math.min(eIn, border));
+            double firstPart = NumassIntegrator.getFastInterator().integrate(u, Math.min(eIn, border), integrand);
             double secondPart;
             if (eIn > border) {
                 if (fast) {
-                    secondPart = NumassIntegrator.getDefaultIntegrator().integrate(integrand, border, eIn);
+                    secondPart = NumassIntegrator.getDefaultIntegrator().integrate(border, eIn, integrand);
                 } else {
-                    secondPart = NumassIntegrator.getHighDensityIntegrator().integrate(integrand, border, eIn);
+                    secondPart = NumassIntegrator.getHighDensityIntegrator().integrate(border, eIn, integrand);
                 }
             } else {
                 secondPart = 0;
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassFitScanSummaryTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassFitScanSummaryTask.java
index 3aa7b105..ab7a3123 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassFitScanSummaryTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassFitScanSummaryTask.java
@@ -12,6 +12,7 @@ import hep.dataforge.data.DataNode;
 import hep.dataforge.data.DataSet;
 import hep.dataforge.description.TypedActionDef;
 import hep.dataforge.meta.Laminate;
+import hep.dataforge.meta.Meta;
 import hep.dataforge.stat.fit.FitResult;
 import hep.dataforge.stat.fit.ParamSet;
 import hep.dataforge.stat.fit.UpperLimitGenerator;
@@ -41,12 +42,11 @@ public class NumassFitScanSummaryTask extends AbstractTask<Table> {
     }
 
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        //Transmit meta as-is
-        model.dependsOn("fitscan", model.meta(), "fitscan");
-        return model;
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        model.dependsOn("fitscan", meta, "fitscan");
     }
 
+
     @Override
     public String getName() {
         return "scansum";
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassFitScanTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassFitScanTask.java
index f7d8d7eb..b8f0af46 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassFitScanTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassFitScanTask.java
@@ -78,17 +78,14 @@ public class NumassFitScanTask extends AbstractTask<FitResult> {
     }
 
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        //Transmit meta as-is
-        MetaBuilder metaBuilder = new MetaBuilder(model.meta()).removeNode("fit").removeNode("scan");
-        if (model.meta().hasMeta("filter")) {
-            model.dependsOn("filter", metaBuilder.build(), "prepare");
-        } else if (model.meta().hasMeta("empty")) {
-            model.dependsOn("subtractEmpty", metaBuilder.build(), "prepare");
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        if (meta.hasMeta("filter")) {
+            model.dependsOn("filter", meta, "prepare");
+        } else if (meta.hasMeta("empty")) {
+            model.dependsOn("subtractEmpty", meta, "prepare");
         } else {
-            model.dependsOn("prepare", metaBuilder.build(), "prepare");
+            model.dependsOn("prepare", meta, "prepare");
         }
-        return model;
     }
 
     @Override
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassFitSummaryTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassFitSummaryTask.java
index be604596..16795af0 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassFitSummaryTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassFitSummaryTask.java
@@ -19,7 +19,6 @@ package inr.numass.tasks;
 import hep.dataforge.actions.Action;
 import hep.dataforge.data.DataNode;
 import hep.dataforge.meta.Meta;
-import hep.dataforge.meta.MetaBuilder;
 import hep.dataforge.stat.fit.FitState;
 import hep.dataforge.tables.Table;
 import hep.dataforge.workspace.SingleActionTask;
@@ -51,12 +50,7 @@ public class NumassFitSummaryTask extends SingleActionTask<FitState, Table> {
     }
 
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        //Transmit meta as-is
-        MetaBuilder meta = model.meta().getBuilder().removeNode("summary");
-        model.dependsOn("fit", meta.build(), "fit");
-        return model;
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        model.dependsOn("fit", meta, "fit");
     }
-
-
 }
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassFitTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassFitTask.java
index 93b2424e..7f118dda 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassFitTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassFitTask.java
@@ -20,7 +20,6 @@ import hep.dataforge.actions.Action;
 import hep.dataforge.actions.ActionUtils;
 import hep.dataforge.data.DataNode;
 import hep.dataforge.meta.Meta;
-import hep.dataforge.meta.MetaBuilder;
 import hep.dataforge.plotfit.PlotFitResultAction;
 import hep.dataforge.stat.fit.FitAction;
 import hep.dataforge.stat.fit.FitResult;
@@ -65,17 +64,15 @@ public class NumassFitTask extends SingleActionTask<Table, FitResult> {
         return model.meta().getMeta("fit");
     }
 
+
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        //Transmit meta as-is
-        MetaBuilder metaBuilder = new MetaBuilder(model.meta()).removeNode("fit");
-        if (model.meta().hasMeta("filter")) {
-            model.dependsOn("filter", metaBuilder.build(), "prepare");
-        } else if (model.meta().hasMeta("empty")) {
-            model.dependsOn("subtractEmpty", metaBuilder.build(), "prepare");
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        if (meta.hasMeta("filter")) {
+            model.dependsOn("filter", meta, "prepare");
+        } else if (meta.hasMeta("empty")) {
+            model.dependsOn("subtractEmpty", meta, "prepare");
         } else {
-            model.dependsOn("prepare", metaBuilder.build(), "prepare");
+            model.dependsOn("prepare", meta, "prepare");
         }
-        return model;
     }
 }
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassPrepareTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassPrepareTask.java
index 7562c561..c7ba2ca9 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassPrepareTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassPrepareTask.java
@@ -84,13 +84,12 @@ public class NumassPrepareTask extends AbstractTask<Table> {
     }
 
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        if (model.hasValue("data.from")) {
-            model.data(model.getString("data.from.*"));
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        if (meta.hasValue("data.from")) {
+            model.data(meta.getString("data.from.*"));
         } else {
             model.data("*");
         }
-        return model;
     }
 
 //    private DataSet.Builder<NumassData> readData(Work callback, Context context, URI numassRoot, Meta meta) {
diff --git a/numass-main/src/main/java/inr/numass/tasks/NumassTableFilterTask.java b/numass-main/src/main/java/inr/numass/tasks/NumassTableFilterTask.java
index b2b2c9d9..5b852e98 100644
--- a/numass-main/src/main/java/inr/numass/tasks/NumassTableFilterTask.java
+++ b/numass-main/src/main/java/inr/numass/tasks/NumassTableFilterTask.java
@@ -6,7 +6,7 @@ import hep.dataforge.context.Context;
 import hep.dataforge.data.DataNode;
 import hep.dataforge.description.TypedActionDef;
 import hep.dataforge.meta.Laminate;
-import hep.dataforge.meta.MetaBuilder;
+import hep.dataforge.meta.Meta;
 import hep.dataforge.tables.Table;
 import hep.dataforge.tables.TableTransform;
 import hep.dataforge.values.Value;
@@ -34,15 +34,14 @@ public class NumassTableFilterTask extends SingleActionTask<Table, Table> {
         return data.getCheckedNode("prepare", Table.class);
     }
 
+
     @Override
-    protected TaskModel transformModel(TaskModel model) {
-        MetaBuilder metaBuilder = new MetaBuilder(model.meta()).removeNode("filter");
-        if (model.meta().hasMeta("empty")) {
-            model.dependsOn("subtractEmpty", metaBuilder.build(), "prepare");
+    protected void updateModel(TaskModel.Builder model, Meta meta) {
+        if (meta.hasMeta("empty")) {
+            model.dependsOn("subtractEmpty", meta, "prepare");
         } else {
-            model.dependsOn("prepare", metaBuilder.build(), "prepare");
+            model.dependsOn("prepare", meta, "prepare");
         }
-        return model;
     }
 
     @Override
diff --git a/numass-main/src/test/java/inr/numass/models/TestNeLossParametrisation.java b/numass-main/src/test/java/inr/numass/models/TestNeLossParametrisation.java
index 9dfa50e8..d41c82ab 100644
--- a/numass-main/src/test/java/inr/numass/models/TestNeLossParametrisation.java
+++ b/numass-main/src/test/java/inr/numass/models/TestNeLossParametrisation.java
@@ -37,7 +37,7 @@ public class TestNeLossParametrisation {
         UnivariateFunction oldFunction = LossCalculator.getSingleScatterFunction();
         UnivariateFunction newFunction = getSingleScatterFunction(12.86, 16.78, 1.65, 12.38, 4.79);
 
-        Double norm = new GaussRuleIntegrator(200).integrate(newFunction, 0d, 100d);
+        Double norm = new GaussRuleIntegrator(200).integrate(0d, 100d, newFunction);
 
         System.out.println(norm);