First extract the SN table from aips using the TBOUT task. It is important to
set the DOCRT adverb large enough
so that all data for a single (IF, Antenna, Time) are on the same
line. DOCRT = 1000 is a safe setting. Then, to use the script, type:
snedit.pl <input SN file> <output SN file>
for example, if TBOUT wrote a file called SN6.TXT:
snedit.pl
SN6.TXT SN7.TXT
Solutions may then be flagged by clicking the left mouse button at the time of
the point to be flagged, or over a range of times by pressing the "C" key. Solutions may be flagged in both IFs simultaneously or separately.
The "M" function allows measurement of the mean value of phase, delay and
rate for a time range of SN table values and prints these values for
use with the AIPS task CLCOR.
For a
full list of commands, type "h" or "?" from the plot window.
In the example above, the file SN7.TXT is written and may be read back into AIPS using the TBIN task.
Note when using CLCOR to make an adjustment to the relative phase ('PHAS')
of the two IFs, the phase sign must be entered into the CLCORPRM values as:
CLCORPRM = -<sneditPhaseValue>, 0
When correcting the Single band delay ('SBDL') values with CLCOR, the
two IF independent delay values are averaged. The sign convention is
CLCORPRM = <sneditDelayValue>, <sneditDelayValue>, 0