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For ALMA Cycle 3 (and onward) data, determines the channel averaging factor from
the ratio of the effective channel bandwidth to the channel width, and comparing it to the dictionary values
in windowFunction.
Usage:
au.onlineChannelAveraging(vis, spw)
Inputs:
vis: measurement set
spw: integer ID
Example:
CASA <2>: au.onlineChannelAveraging('uid___A002_Xac0269_X756.ms.split.cal',2)
Out[2]: 2