TWIST Technote 80
MC fitting: the spectrum expansion
Andrei Gaponenko, Monday Apr 28, 2003
Here a note on MC fitting.  Mainly it's math to get the coefficients
in front of delta_rho etc. right.  Implementation details will be
described elsewhere.  Thanks to Blair for proof-reading that led to
improvements in the wording.
Abstract: 
This note derives a parametrization of a reconstructed spectrum in
terms of deviations of parameters of the corresponding "true"
spectrum.  It also explains how to obtain all the terms involved using
Monte-Carlo integration.