linefitd { peak_ID line_shape amp freq line_width } (n times) 0

Start the line fitter, fitting only the selected parameters to fit.
The command will prompt for the index of the peak to fit, for the
parameters to fit for that peak. Several peaks can be fitted at
once, the list is finished with a 0.

All questions are answered with yes/no, but line_shape which is to
be Lorentz/Gauss for Loretzian or Gaussian line-shapes.
In all cases, the command LINEFITD %% fits all the peaks, retaining
the current line-shape of each peaks.

All the values in the peak-table will be used, but only the line
with the selected parameters will be adjusted. Unknown line shapes
will be assumed to be Lorentzian.

see also : linefit get

NPK Documentation, version 0.995 - 2009-10-14