Mark,

Please check your inbox as I've provided some added instructions.  For all others, there is a python script which can be found on the PyMOL-Wiki that was specifically written to generate custom spectrum bars.  It's very easy to use. 

http://www.pymolwiki.org/index.php/Spectrumbar

To specify a spectrum bar from "gray10" to "gray90" just simply run the script and type

spectrumbar gray10, gray90

For more color control:

spectrumbar gray10, gray20, gray30, gray40, gray50, gray60, gray70, gray80, gray90

You can also use RGB values at any time:

spectrumbar gray10, 1,0,0,  gray90

The width of the bar can be specified by "radius" option and the length of bar can be specified with the "length" option.

Enjoy.

Sean


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