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Hi, It works now by defining Sys = {Sys1,Sys2}; Vary = {Vary1,Vary2}; as 1X2 cells and reading out the relevant entries of the structures: function y = Constraints(Sys,Exp,Opt) fullSys0 = Sys{1,1}; fullSys0.A = [Sys{1,1}.A(1,:); Sys{1,1}.A(2,:); Sys{1,1}.A(2,:); Sys{1,1}.A(2,:); Sys{1,1}.A(2,:)]; fu...

Dear community, I would like to fit an solid state EPR spectrum, using a user defined function for simulation with pepper. There are 2 spin Systems: (S =1/2, 4 equivalent N nuclei, axial system) and (S=1/2, 4 equivalent N nuclei, 1 Au nucleus, rhombic system). I found in the EasySpin documentation o...