oldhanningsmooth – Hanning smooth frequency channel data to remove Gibbs ringing – manipulation task

Description

T H I S T A S K I S D E P R E C A T E D I T W I L L B E R E M O V E D S O O N

This function Hanning smoothes the frequency channels with a weighted running average. The weights are 0.5 for the central channel and 0.25 for each of the two adjacent channels. The first and last channels are flagged. Inclusion of a flagged value in an average causes that data value to be flagged. If an ‘outputvis’ filename is given, the task will copy the input file to the output file name first, including all columns that are present in the input MS. After that step it will smooth the column(s) as requested in the ‘datacolumn’ parameter. Alternatively, if no ‘outputvis’ is specified, oldhanningsmooth will work directly on the input visibility file. If the ‘CORRECTED’ data column is requested for an MS that does not contain this column, it will be filled from the ‘DATA’ column and then smoothed.

WARNING: by default, all visibility columns will be smoothed. This will

modify the DATA column of the output MS in order to make sure that later gaincal will work on the smoothed data, e.g. as part of self-cal.

Parameters

Title

Parameter	Default	Description
vis	''
datacolumn	'all'
outputvis	''

Parameter Explanations

vis

''

Name of input visibility file (MS)

datacolumn

'all'

the name of the MS column into which to write the smoothed data

outputvis

''

name of the output visibility file (MS)