Z=0.5
m=1.
b=0.2

beta=80.


f(x)=(1.-1./Z)*x+b
g(x)=(1.-m)*x+b

set xrange[0:30./beta]

p "sig.inp" u 1:7 w lp lw 2

fit[0:15./beta] f(x) "sig.inp" u 1:7 via Z,b
fit[0:15./beta] g(x) "sig.inp" u 1:7 via m,b

rep f(x)