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It overlays multiple PostScript files into one, coloring each one
sequentially in a color range, which is defined at the beginning of
the
file. It's intended for a titration experiment, where you have, say,
20 HSQC (2D) spectra that you'd like to compare. Felix does not make
it
easy to overlay them, and the color selection is very limited. The
same for
NMRview. This helps.
This is useful for highlighting small differences between a range of spectra. Here's a portion of one overlay of 20 spectra from red to cyan (note that you can pick your own colors):
So, once you have this, the cumbersome part becomes generating a directory full of PostScript files of your spectra, with the same dimensions, limits, etc. Haitao helped me write a Felix macro called batchmplot.mac which automates this. It is not general enough for distribution (relies on a list of files), but you can certainly use it as a template for your own project if you wish.
Hope this is useful.