Creating TIDE Housekeeping Trend Plots (revised 12/02/05)
--------------------------------------

As part of the daily TIDE summary plot generation, files containing the TIDE
housekeeping bytes are created.  These daily files are stored on griffin in

    /export/data/tide/hk

The filenames are tyymmdd0000_2400.hk.  They are binary files containing time
and 49 housekeeping bytes every major frame (9.2 seconds).  Each file will be
~619,000 bytes long, unless there is missing telemetry data.  If a file is 
much larger than 619000, it needs to be recreated.  See the summary plot
documentation for instructions on creating the file.
 
Before creating the summary plots, the daily files need to be concatenated.
This needs to be done each month when all the data for a month is available or
whenever trend plots are requested.  To concatenate the files:

   del cat_hk
   ls -1 tyymn*hk > cat_hk

   vi cat_hk
      type icat <esc>JJjJJjJJjJJ
      continue the JJj sequence until all the lines have been joined.
      move to the end of the first line and type a \<esc>j
      until you get to the last line type .j
      on the last line type a > tyymm.hk<esc>
      type :wq

   chmod +x cat_hk
   cat_hk

You should now have a binary file containing a months worth of data.

Once you have the large hk file type  psi_trend.  You will be asked the name of
the hk file and the name of the output file, use 'tyymm_trend.psi'.  You will be
asked how many points to plot, use 3.  psi_trend creates the input to the PSI
trend plot routine.  To create the TIDE trend input, type  tide_trend.
Call the output file 'tyymm_trend.tide'.  To plot the data, get into idl.

       IDL> .run tide_trend
          TIDE Trend filename: tyymm_trend.tide
          what next: 1
          what next: 0

       IDL> .run psi_trend
          PSI Trend filename: tyymm_trend.psi
          what next: 1
          what next: 0

       IDL> exit

Edit pdf_make and change the filenames, then run it to convert the ps to pdf 
files.  Use cp_plots to copy the trend plots to the temporary plots storage 
site on satyr.

Move tyymm.hk to old_data and qzip it.  Delete all the tyymmdd0000_2400.hk 
daily files for the month and all the tyymm* plot and trend files.