0. Start IRAF and load the tres package by typing

ecl> tres
     [a banner appears]
tres>

   If the banner message says  *** Run trelearn to update parameters ***
   type

tres> trelearn

   If this task crashes, run it again.  I haven't figured out how to deal
   cleanly with deleted parameters.

1. Run trsdate yyyy.mmdd to put yourself in the correct working directory
   The date is saved as a parameter, so if you have to leave IRAF for some
   reason, or make sure that you are in the right directory, all you have to
   to is type

tres> trsdate
Date for images (now=today) (2009.0311): [return]
tres> pwd
/home/user/tresq/2009.0311

2. Run trsgroup to make lists of similarly configured files.  Run this after
   several FLAT and COMP exposures have been made.  If trsgroup.redo=yes,
   the default value, th old lists and data.db file will be deleted and new,
   updated lists will be written.

3. Run ftres on lists of similarly configured flat files (FLATmb12x40.list, for example)
   For the first night of a run or if the fibers have been moved, run this interactively:

tres> ftres FLATmb12x40 sumspec+ makeref+ interact+

   See tmakeref/ for an example of how to set up the aperture reference files.

4. Run ttres on multiple exposures at the beginning of the night to get night
   references for each configuration.

   To set a medium fiber binned standard from three exposures, for example

tres> cat COMPmb12.list
0035.COMP.fits
0036.COMP.fits
0037.COMP.fits
0062.COMP.fits
0096.COMP.fits
0124.COMP.fits
tres> ttres 35-37 compstd="sum" compid+

   compstd="sum" will run tcal1 to fit dispersion functions for both
   apertures of the summed calibration file.  compid+ should put you
   in interactive mode to examine the lines which are found and the
   fit the ecidentify task gets to them.

   If the cross-correlation program, pxcsao, crashes on one of the two
   fibers, the tcal1 program is really what is crashing.  Run it on the
   individual fibers:

tres> tcal1 0205.COMP_sum_0142_0143_f2.ec.fits interact+

   If it runs through and the resulting wavelength solution looks offset when
   you plot it with tharplot, delete the two _f*.ec.fits files, and run textract
   on the image file

tres> textract 0207.COMP_sum_0035_0124.fits

   Then run tcal1 to fit the dispersion function:

tres> tcal1 0207.COMP_sum_0035_0124_f2.ec.fits interact+

   and plot it with the ThAr lines labelled using tharplot:

tres> tharplot 0207.COMP_sum_0035_0124_f2.ec.fits