@Markiyan Hirnyk 4223 Thanks for your help. This is the file which works when sigma=0.1SISO.mws

@Markiyan Hirnyk 4223 Thanks for your help. But this integration already has value from 10^-1 to 10^-9. Also I get the result when sigma=0.1.

Sorry, I did                 not understand your comment.