                                              June 1999  (Michael Hoenig)

Cambridge Infra-Red Data Reduction software (CIRDR) news


Just a quick note to let you know I have released a new version of cirdr,
v1.1. The corresponding cqlook version is now 2.1.

The following features are new in this release:

- Changed the destriping code to allow for three new destriping options,
which correspond to Mike Irwin's original 'drift' code (ie. pre-fdrift).  
This was done since it has been discovered that fdrift introduces offsets
between the quadrants when destriping.
So the seven options for destriping now are:
        fd - default: use fdrift. NB. the name has been changed, this
             option was previously named "MB". Destriping is done in both
             directions by default.
             You might want to "unlearn" your cndrproc parameters to avoid
             confusion!
        dB - drift, correct in both directions
        dR - dto, rows only
        dC - dto, columns only
        B  - Josephine's SPP version of the destriping algorithm, based
             on an earlier version of drift. Both directions.
        R  - dto, rows only
        C  - dto, columns only
Please note that while drift does not introduce the offsets between
quadrants seen in fdrift, it does seem to butcher the FITS headers
somewhat, which could be a problem.
Hopefully I will be able to provide a fixed version of fdrift soon that
we can revert to.
        
- Removed some redundant options from cndrproc. These were originally
requested by rgm (they concern stopping after reset-correction or chip
assembly) but are now obsolete.
          
- Added a note stating that in certain cases, cndrproc will claim it
cannot find the specified images if the image prefix in the file name (the
string before the run no.) does not match the OBJECT keyword in the
header. This is the case for a number of November '99 images where the
object name is simply "r"...
Suggested remedy: batch rename the images.


That's it for now. May your usage of cirdr bring you much joy for years to
come,


Mike


