National Radio
Astronomy Observatory

4.7.1.1 Averaging in split

Time and channel averaging are now available using the timebin and width parameters.

The timebin parameter gives the averaging interval. It takes a quantity, e.g.

When time averaging, the ignorables subparameter can be used to specify that the bins should not be split by changes in SCAN_NUMBER, (sub)ARRAY_ID, and/or STATE_ID.

The width parameter defines the number of channels to average to form a given output channel. This can be specified globally for all spw, e.g.

or specified per spw, e.g.

to average 2 channels of 1st spectral window selected and 3 in the second one.

ALERT: When averaging channels split will produce negative channel widths (as reported by listobs) if frequency goes down with increasing channel number, whether or not the input channel widths are negative. The bandwidths and channel resolutions will still be positive.”

More information about CASA may be found at the CASA web page

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