[Ifeffit] High SO2

[Matt Newville]

Scott,

I read Abhijeets's
    But what I know about fitting is that we have to first fit the
first shell and then
    keeping the first shell  parameter constant , we go for the next shell

and Jeremy's
  I typically perform the fitting as you suggest, at least in
complicated systems, one shell at a time.

to mean they fit one shell at a time, that is: when the second shell
is being fitted, the first is not and the fit R-range is changed for
the 2nd shell fit to not include (most of) the first shell.   As you
say,  there is very little value in having the R-range include the
first shell if you're not actually adjusting parameters that affect
that part of the spectrum.

--Matt