At the US Naval Observatory, raw data from the interferometer is first
reduced with CONSTRICTOR, which is a stand-alone program. It computes
the visibilities and averages the data into 1 second intervals, the
so-called point data. Averaged raw data from CONSTRICTOR can be found
in /home/constrictor on octans at the site. It is best to start
up
in a directory owned by the user, and then to enter the full
path to the data file when opening it. The path is stripped off by
when deriving output file names from the input file name so that all files
are written into the local directory. Due to the size of the .con
files, it is best not to make copies of them.
Averaged scan data from
is output into HDS files with the extension
.cha. If you have a file with unknown history, the data might have
been calibrated, or they might not. It is best to assume that they have to
be calibrated, in which case one should remove any existing calibration
before continuing. In order to find the right file for observations of a
particular star, use the obsdates procedure (see section 19.8).