Changed guessed Q from 5 to 1, which gives about the right breadth.

Changed guessed Q from 5 to 1, which gives about the right breadth.

I'm dubious about the fit quality though.  Looking at the fit.log
output after looking at the 20080919_cantA_tweak.vib data again reveals
  After 4 iterations the fit converged.
  final sum of squares of residuals : 9.6001e+08
  rel. change during last iteration : -2.46003e-07
for the first curve, and similar residuals (and exactly 4 iterations)
for the other curves.  Hmm.  I should probably explicitly show the range
of frequency space I'm fitting in.