/usr/share/doc/fityk/samples/read-shockley.fit is in fityk 0.9.8-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | # Fityk 0.9.7
### see: https://github.com/wojdyr/fityk/wiki/ReadShockley
M=9
X[0]=0, X[1]=4.24, X[2]=6.73, X[3]=8.80, X[4]=10.39, X[5]=12.68, X[6]=14.25, X[7]=16.26, X[8]=18.93
Y[0]=0, Y[1]=1.06, Y[2]=1.39, Y[3]=1.61, Y[4]= 1.75, Y[5]= 1.94, Y[6]= 2.07, Y[7]= 2.02, Y[8]= 2.30
A = X > 0 and X < 15
# Read-Shockley equation (with degrees to radians conversion)
define ReadShockley(sigma0=1, a=1) = sigma0 * t * (a - ln(t)) where t=x*pi/180
guess ReadShockley
plot []
fit
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