From akemball@aoc.nrao.edu Tue Jan 22 18:25:37 2002
Date: Tue, 22 Jan 2002 14:05:00 -0700 (MST)
From: Athol Kemball <akemball@aoc.nrao.edu>
Reply-To: aips2-naug@donar.cv.nrao.edu
To: aips2-naug@maser.aoc.NRAO.EDU
Cc: akemball@maser.aoc.NRAO.EDU
Subject: [Aips2-naug] MS compression


Dear NAUG,

In v1.6 we put in place the infrastructure for a compressed
MS format, and this will become incrementally available in 
v1.7 as we incorporate this option into each data filler.
As a first step the columns added by imager can now be
compressed, by creating imager with a compress flag:

myimager:=imager(msfile, compress=T)

This is active the first time imager reads a dataset,
which is the time at which these columns are added.

The compression is a factor two, with a resulting dynamic
range restriction of 2^16 to 1. The resulting MS
can be used with other tools as before, without
changing any other script parameters. Compression is
most useful for line data.

If you encounter any difficulties using compression
please file a defect. This feature is available
from the last weekly of 02/18/2002.

Thanks,
Athol



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