Glossary/Abbreviation for namelist:

OPD	: Optical Path Difference
CDF	: cummulative distribution function.  in the case of undulators,
	  this is the SHADOW file generated by the utility make_id.
OE	: Optical Element
TGM	: Toroidal Grating Monochromator
ERG	: Extended Range Grasshopper
MRF	: Mirror Reference Frame
FWHM	: Full Width Half Maximum
SRF	: Source Reference Frame
