diff --git a/numass-main/build.gradle b/numass-main/build.gradle
index bf6ff902..ce3660b2 100644
--- a/numass-main/build.gradle
+++ b/numass-main/build.gradle
@@ -17,14 +17,6 @@ dependencies {
     compile project(':dataforge-grind')
 }
 
-task workbench(dependsOn: classes, type: JavaExec) {
-    main 'inr.numass.workbench.Workbench'
-    classpath = sourceSets.main.runtimeClasspath
-    description "start visual numass workbench"
-    group "numass"
-
-}
-
 task listActions(dependsOn: classes, type: JavaExec) {
     main mainClass
     args "-lc"
diff --git a/numass-main/src/main/java/inr/numass/actions/JoinNumassDataAction.java b/numass-main/src/main/java/inr/numass/actions/JoinNumassDataAction.java
index 8ebc5c53..c4485f32 100644
--- a/numass-main/src/main/java/inr/numass/actions/JoinNumassDataAction.java
+++ b/numass-main/src/main/java/inr/numass/actions/JoinNumassDataAction.java
@@ -32,7 +32,6 @@ public class JoinNumassDataAction extends ManyToOneAction<NumassData, NumassData
                     (p1.getUread() + p2.getUset()) / 2,
                     p1.getStartTime(),
                     p1.getLength() + p2.getLength(),
-                    p1.getOverflow() + p2.getOverflow(),
                     IntStream.range(0, p1.getSpectrum().length).map(i -> p1.getSpectrum()[i] * p2.getSpectrum()[i]).toArray()
             );
         }).get();
diff --git a/numass-main/src/main/java/inr/numass/workspace/NumassFitScanSummaryTask.java b/numass-main/src/main/java/inr/numass/workspace/NumassFitScanSummaryTask.java
index 5ba428dd..4b4c6308 100644
--- a/numass-main/src/main/java/inr/numass/workspace/NumassFitScanSummaryTask.java
+++ b/numass-main/src/main/java/inr/numass/workspace/NumassFitScanSummaryTask.java
@@ -35,7 +35,7 @@ public class NumassFitScanSummaryTask extends AbstractTask<Table> {
         DataSet.Builder<Table> builder = DataSet.builder(Table.class);
         Action<FitState, Table> action = new FitSummaryAction().withContext(model.getWorkspace().getContext());
         DataNode<FitState> input = data.getCheckedNode("fitscan", FitState.class);
-        input.nodeStream().forEach(node ->
+        input.nodeStream(false).forEach(node ->
                 builder.putData(node.getName(), action.run(node, model.meta()).getData()));
         return builder.build();
     }
diff --git a/numass-storage/src/main/java/inr/numass/storage/NMPoint.java b/numass-storage/src/main/java/inr/numass/storage/NMPoint.java
index 652071cb..0d01e4ad 100644
--- a/numass-storage/src/main/java/inr/numass/storage/NMPoint.java
+++ b/numass-storage/src/main/java/inr/numass/storage/NMPoint.java
@@ -33,19 +33,17 @@ public class NMPoint {
     private final int[] spectrum;
     private Instant startTime;
     private long eventsCount;
-    private int overflow;
     private double pointLength;
     private double uread;
     private double uset;
 
-    public NMPoint(double uset, double uread, Instant startTime, double pointLength, int overflow, int[] spectrum) {
+    public NMPoint(double uset, double uread, Instant startTime, double pointLength, int[] spectrum) {
         this.startTime = startTime;
-        this.overflow = overflow;
         this.pointLength = pointLength;
         this.spectrum = spectrum;
         this.uread = uread;
         this.uset = uset;
-        this.eventsCount = IntStream.of(spectrum).sum() + overflow;
+        this.eventsCount = IntStream.of(spectrum).sum();
     }
 
     public NMPoint(RawNMPoint point) {
@@ -64,11 +62,11 @@ public class NMPoint {
     private int[] calculateSpectrum(RawNMPoint point) {
         assert point.getEventsCount() > 0;
 
-        int[] result = new int[RawNMPoint.MAX_CHANEL];
+        int[] result = new int[RawNMPoint.MAX_CHANEL + 1];
         Arrays.fill(result, 0);
         point.getEvents().stream().forEach((event) -> {
             if (event.getChanel() >= RawNMPoint.MAX_CHANEL) {
-                overflow++;
+                result[RawNMPoint.MAX_CHANEL]++;
             } else {
                 result[event.getChanel()]++;
             }
@@ -136,12 +134,12 @@ public class NMPoint {
     }
 
     /**
-     * Events count + overflow
+     * Events count including overflow
      *
      * @return
      */
     public long getEventsCount() {
-        return eventsCount + getOverflow();
+        return eventsCount;
     }
 
     public List<DataPoint> getData(int binning, boolean normalize) {
@@ -211,7 +209,7 @@ public class NMPoint {
      * @return the overflow
      */
     public int getOverflow() {
-        return overflow;
+        return spectrum[RawNMPoint.MAX_CHANEL];
     }
 
     /**