Hi,
In my Z' model hypercharge comes from the breaking of a higher SU2 x U1' so to get the actual MZ I commented some lines in "Set pole masses" in one of the .f90 routines (I set flag #61 to zero for no running). My MZ is very sensitive to whatever value of g2 is used by SPheno. How exactly is the g2 appearing in the .spc file set by the SMINPUTS? Is it possible to force a distinct value in SPheno.m without forcing g2 to be one of the MINPAR elements?