diff --git a/+SimplusGT/+Modal/AppModalAnalysis.m b/+SimplusGT/+Modal/AppModalAnalysis.m
index d45a23c7..e7789063 100644
--- a/+SimplusGT/+Modal/AppModalAnalysis.m
+++ b/+SimplusGT/+Modal/AppModalAnalysis.m
@@ -56,15 +56,15 @@
     for k=1:length(ApparatusType)
         if ApparatusType{k} <= 89 % Ac apparatus
             IMR.Type(count) = ApparatusType{k};
-            IMR.IMRVal(count) = SigmaMag/norm(Residue{k},"fro")*norm(ZmVal{k},"fro");
+            IMR.IMRVal(count) = SigmaMag/(norm(Residue{k},"fro")*norm(ZmVal{k},"fro"));
             count = count+1;
         elseif ApparatusType{k} >= 1000 && ApparatusType{k} <= 1089 % Dc apparatus
             IMR.Type(count) = ApparatusType{k};
-            IMR.IMRVal(count) = SigmaMag/norm(Residue{k},"fro")*norm(ZmVal{k},"fro");
+            IMR.IMRVal(count) = SigmaMag/(norm(Residue{k},"fro")*norm(ZmVal{k},"fro"));
             count = count+1;
         elseif ApparatusType{k} >= 2000 && ApparatusType{k} <= 2009 % Interlink apparatus
             IMR.Type(count) = ApparatusType{k};
-            IMR.IMRVal(count) = SigmaMag/norm(Residue{k},"fro")*norm(ZmVal{k},"fro");
+            IMR.IMRVal(count) = SigmaMag/(norm(Residue{k},"fro")*norm(ZmVal{k},"fro"));
             count = count+1;
         elseif  ApparatusType{k} == 90 || ApparatusType{k} == 1090   % infinite bus: let IMR=inf
             IMR.Type(count) = ApparatusType{k};