diff --git a/numass-main/src/main/groovy/inr/numass/scripts/ShowSpectrum.groovy b/numass-main/src/main/groovy/inr/numass/scripts/ShowSpectrum.groovy
new file mode 100644
index 00000000..8cb7a8f8
--- /dev/null
+++ b/numass-main/src/main/groovy/inr/numass/scripts/ShowSpectrum.groovy
@@ -0,0 +1,65 @@
+package inr.numass.scripts
+
+import hep.dataforge.context.Global
+import hep.dataforge.grind.Grind
+import hep.dataforge.meta.Meta
+import hep.dataforge.stat.fit.FitPlugin
+import hep.dataforge.stat.fit.ParamSet
+import hep.dataforge.stat.models.XYModel
+import inr.numass.NumassPlugin
+
+/**
+ * Created by darksnake on 14-Dec-16.
+ */
+
+
+Locale.setDefault(Locale.US);
+new NumassPlugin().startGlobal();
+
+
+def fm = Global.instance().provide("fitting", FitPlugin.class).getFitManager();
+def mm = fm.modelManager
+
+
+Meta modelMeta = Grind.buildMeta(modelName: "sterile") {
+    resolution(width: 8.3e-5, tailAlpha: 3e-3)
+    transmission(trapping: "function::numass.trap.nominal") // numass.trap.nominal = 1.2e-4 - 4.5e-9 * Ei
+}
+
+/*
+
+ 'N'	= 2.76515e+06 ± 2.4e+03	(0.00000,Infinity)
+ 'bkg'	= 41.195 ± 0.053
+ 'E0'	= 18576.35 ± 0.32
+ 'mnu2'	= 0.00 ± 0.010
+ 'msterile2'	= 1000000.00 ± 1.0
+ 'U2'	= 0.00314 ± 0.0010
+ 'X'	= 0.12000 ± 0.010	(0.00000,Infinity)
+ 'trap'	= 1.089 ± 0.026
+ */
+
+Meta paramMeta = Grind.buildMeta("params") {
+    N(value: 2.76515e+06, err: 30, lower: 0)
+    bkg(value: 41.195, err: 0.1)
+    E0(value: 18576.35, err: 0.1)
+    mnu2(value: 0, err: 0.01)
+    msterile2(value: 1000**2, err: 1)
+    U2(value: 0.00314, err: 1e-3)
+    X(value: 0.12000, err: 0.01, lower: 0)
+    trap(value: 1.089, err: 0.05)
+}
+
+XYModel model = mm.buildModel(modelMeta)
+
+ParamSet allPars = ParamSet.fromMeta(paramMeta);
+
+def a = 16000;
+def b = 18600;
+def step = 50;
+
+
+for (double x = a; x < b; x += step) {
+    println "${x}\t${model.value(x, allPars)}"
+}
+
+Global.terminate()
\ No newline at end of file
diff --git a/numass-viewer/src/main/java/inr/numass/viewer/NumassLoaderViewComponent.java b/numass-viewer/src/main/java/inr/numass/viewer/NumassLoaderViewComponent.java
index 16072c7a..8c03dcf6 100644
--- a/numass-viewer/src/main/java/inr/numass/viewer/NumassLoaderViewComponent.java
+++ b/numass-viewer/src/main/java/inr/numass/viewer/NumassLoaderViewComponent.java
@@ -27,7 +27,10 @@ import hep.dataforge.io.ColumnedDataWriter;
 import hep.dataforge.meta.Meta;
 import hep.dataforge.meta.MetaBuilder;
 import hep.dataforge.plots.XYPlotFrame;
-import hep.dataforge.plots.data.*;
+import hep.dataforge.plots.data.PlotDataUtils;
+import hep.dataforge.plots.data.PlottableData;
+import hep.dataforge.plots.data.TimePlottable;
+import hep.dataforge.plots.data.TimePlottableGroup;
 import hep.dataforge.plots.fx.FXPlotFrame;
 import hep.dataforge.plots.fx.PlotContainer;
 import hep.dataforge.plots.jfreechart.JFreeChartFrame;
@@ -81,7 +84,7 @@ public class NumassLoaderViewComponent extends AnchorPane implements Initializab
     private PlotContainer detectorPlot;
     private PlotContainer spectrumPlot;
     private PlotContainer hvPlot;
-    private ChangeablePlottableData spectrumData;
+    private PlottableData spectrumData;
     private List<NMPoint> points;
     private ChoiceBox<Integer> detectorBinningSelector;
     private CheckBox detectorNormalizeSwitch;
@@ -287,7 +290,7 @@ public class NumassLoaderViewComponent extends AnchorPane implements Initializab
 
     private void setupSpectrumPane(List<NMPoint> points) {
         if (spectrumData == null) {
-            spectrumData = new ChangeablePlottableData("spectrum");
+            spectrumData = new PlottableData("spectrum");
             spectrumPlot.getPlot().add(spectrumData);
         }