diff --git a/BP_analysis.cpp b/BP_analysis.cpp
index a05ad3d..31313e7 100644
--- a/BP_analysis.cpp
+++ b/BP_analysis.cpp
@@ -13,6 +13,18 @@
 #include "TLegend.h"
 #include "TPaveText.h"
 
+double checkRangeMaxForAmplifierPlateau(double range_max) {
+  
+  // check that the range maximum is no more than 6.4 V
+  // to avoid non-linearity coming from amplifier plateau
+  if (range_max > 6400) {
+    return 6400;
+  } else {
+    return range_max;
+  }
+  
+}
+
 int main(int argc, char* argv[]) {
 
   jungfrauStyle();
@@ -501,6 +513,7 @@ int main(int argc, char* argv[]) {
 
       rangemin_g1 = lowestPointAfterSwitching(r1_filter,r0_filter);
       rangemax_g1 = *max_element(r1_filter.begin(),r1_filter.end());
+      rangemax_g1 = checkRangeMaxForAmplifierPlateau(rangemax_g1);
 
       if (rangemax_g1 > rangemin_g1) {