The directory  
           /home/imc/pointing/track 
holds programs for analyzing long-integration maps of bright 
targets in order to determine the centroid of the image at each cycle,
with the aim of deriving and plotting the pointing residuals 
as a function of, eg, azimuth. This provides the information
needed to correct any detected irregularities via look-up
tables such as /jac_sw/itsroot/src/tcs/params/thi_empirical.dat

20070711 

HARP/ACSIS data : jiggle-chop or jiggle-pssw

Use acsis 'spectra' files (prior to gridding) as input.

1. Extract centroids using

        extract_centroids.com

This produces a file of az & el residuals :
            cen_dazdel.log
containing offsets of the centroids from the array centre:
one value per observation cycle.

2. Extract azimuths & elevations using

       ave9azel.exe   or ave116azel.exe

This was written with 3x3 (x10") jiggle patterns in mind,
but it is adaptable to 4x4 (x7.5"), which gives full sampling
with HARP. Azimuths and elevations are logged every
phase, but need averaging to one per cycle for compatability
with extract-centroids.

This program also reads   cen_dazdel.log
and outputs   az, el, daz, del   ready for display with
      resplot3.exe
- which also needs to read the latest version of
     thi_empirical.dat
(available at /jac_sw/itsroot/src/tcs/params/thi_empirical.dat
and copied into /home/imc/pointing/track)