From the echellogram table in Appendix 
find the order in which your wavelength
appears, and from the following table get the UG value for the blaze peak in
that order, which occurs at UT 33000. Run the program 22DECUHRF to get mm
positions for USC and UFC, and then run the programs USC and UFC to convert
these to encoder units (ADUs). Configure the spectrograph to those UT, UG, USC,
and UFC settings, at 0.3M resolution. Using the quartz lamp, locate the order,
and then follow it to longer or shorter wavelengths with the ThAr lamp to
identify the target wavelength. Increasing UT moves you to shorter wavelengths
(to see lines higher up the XMEM display), and will require an increase in UG
to compensate the order tilt. The Tek chip dimensions are roughly UT = 2500 ADU,
UG = 1200 ADU.
The following tables list the approximate UG values at which the peak of the blaze is found for each grating and each order.
