Author: bugman
Date: Fri Aug 31 23:36:07 2012
New Revision: 17406
URL: http://svn.gna.org/viewcvs/relax?rev=17406&view=rev
Log:
Added some Sparky info to the Rx curve-fitting chapter of the user manual.
Modified:
trunk/docs/latex/curvefit.tex
Modified: trunk/docs/latex/curvefit.tex
URL:
http://svn.gna.org/viewcvs/relax/trunk/docs/latex/curvefit.tex?rev=17406&r1=17405&r2=17406&view=diff
==============================================================================
--- trunk/docs/latex/curvefit.tex (original)
+++ trunk/docs/latex/curvefit.tex Fri Aug 31 23:36:07 2012
@@ -141,6 +141,9 @@
This will produce the most accurate peak intensity measurements until
better, more robust peak shape integration comes along. This is a special
technique which is designed to minimise the white-noise bias talked about in
the \citet{Viles01} paper. As the noise often decreases with the decrease in
total spectral power, using the tops of the peaks means that you are actually
measuring the real peak height plus positive noise in all cases. This
non-constant additional positive noise contribution can result in a double
exponential in the measured data. The technique above eliminates this as you
then measure close to real peak height with the addition of white noise
centred at zero -- it is both negative and positive to equal amounts --
rather than the peak high with noise contribution strongly biased towards the
positive. Where the peaks disappear, you then are measuring the pure
baseplane noise. This is fine as these white-noise data points centred at
zero will help in the subsequent exponential fit in relax.
+If using Sparky then, to be sure that the peak heights are properly updated,
for each spectrum type `pa' to select all peaks, `ph' to update all selected
peak heights, `lt' to show the spectrum peaks window, make sure `data height'
is selected in the options, and then save the peak list.
+
+
% The sample script.
%%%%%%%%%%%%%%%%%%%%
r17406 - /trunk/docs/latex/curvefit.tex