Most of the code was written by Neil Crighton, with contributions from
Tom Theuns.

The cosmology module is based on a version written by Andrew Becker:
http://www.astro.washington.edu/users/becker/python_software.html

The voigt profile routine is based on a version written by Jochen
Liske in VPGUESS, which can be downloaded from:
http://www.eso.org/~jliske/vpguess/

The sed module is heavily influenced by the astLib sed module by Matt
Hilton: http://astlib.sourceforge.net/

Last updated on 25th April 2012.
