Continuing the discussion from How to get full-energy-peak efficiency? : Dear @horvathd , with reference to your code, I would further like to know what is the function S2FWHM in the code usreou.f

Dear Sujoy, The variable S2FWHM is the conversion factor between the simga and FWHM of a Gaussian distribution. It equals to approximately 2.355, as expected. It is defined in <fluka>/include/dblprc.inc, with many other useful constants. Cheers, David