Specifies the largest scale size to be retained by the initial data cleaning
"filt_edge_smallscale" , this specifies the frequencies
which the initial data cleaning is to remove from the data streams, based on a range of
requested spatial scales (in arcsec), and using internal measurements of the average slew
speed. These will override parameter "filt_edgehigh" and parameter "filt_edgelow" . For
example, suppose the slew speed is 100 arcsec/sec. We want to ensure that the beam is fully
sampled, say 2 arcsec at 450um. That scale is crossed in 2/100 = 0.02 s, so we don’ t need
frequencies in the data above 1/0.02 = 50 Hz in this case (i.e. internally it will set filt_edgelow to
50Hz if filt_edge_smallscale is set to 2 arcsec). Similarly, if we would like to attempt to
preserve scales of 10 arcmin = 600 arcsec, we would want to keep frequencies that are
greater than 1/(600/100.) = 0.17 Hz (i.e. setting filt_edge_largescale=600 would translate into
filt_edgehigh = 0.17 Hz). [0]