diff --git a/plugins/EnergyScan.java b/plugins/EnergyScan.java
index b91ccc8..4b0e0f2 100644
--- a/plugins/EnergyScan.java
+++ b/plugins/EnergyScan.java
@@ -139,17 +139,17 @@ public class EnergyScan extends Panel {
                         data.setSize(c); 
                         idata.setSize(c); 
                         ydata=data.read();                        
-                        double[] io = idata.read();
+                        double[] i0 = idata.read();
                         for (int i=0;i<c;i++){
-                            ydata[c] = (io[c] == 0.0) ? Double.NaN : ydata[c] / io[c];
+                            ydata[i] = (i0[i] == 0.0) ? Double.NaN : ydata[i] / i0[i];
                         }                        
                     } else if (radioTFY.isSelected()){
                         fdata.setSize(c); 
                         idata.setSize(c); 
                         ydata=fdata.read();                        
-                        double[] io = idata.read();
+                        double[] i0 = idata.read();
                         for (int i=0;i<c;i++){
-                            ydata[c] = (io[c] == 0.0) ? Double.NaN : ydata[c] / io[c];
+                            ydata[i] = (i0[i] == 0.0) ? Double.NaN : ydata[i] / i0[i];
                         }                        
                     }   
                     if (ydata==null){