This module allows fitting of families of peaks.
no fit: no fit done
Ax + B: straight line fit
log(A exp(-Bx)): straight line fit of log of data
A exp(-Bx): nonlinear exponential fit of data
A exp(-Bx) + C: nonlinear exponential fit of data with baseline offset
The fit is automatically updated. (The nonlinear fitting might not work perfectly.)