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Quack

is a special option for VLA datasets, to flag the ``quacks'' at the beginning of each scan. It is specified by two numbers, [t_si,$\tau$]. t_si is the scan interval, used to determine the beginning of a new scan. $\tau$ is the number of seconds to flag at the start of a scan.

Arguments

spwid		Spectral window numbers (1-based), or [] or F for all
		Allowed:	Array of ints
		Default:	F
field		Field names or numbers (1-based), or [] or F for all
		Allowed:	Array of ints/strings
		Default:	F
fq		Range(s) of frequencies, or [] or F for all
		Allowed:	2N or (2,N) array of Strings w/units or floats
		Default:	F
chan		Range(s) of channels (1-based), or [] or F for all
		Allowed:	2N or (2,N) array of ints
		Default:	F
corr		Correlations (by name, e.g. ``XX YY''), or [] or F for all
		Allowed:	array of strings
		Default:	F
ant		Antennas (by name or number), or [] or F for all
		Allowed:	array of strings/ints
		Default:	F
baseline		Baselines, or [] or F for all
		Allowed:	array of strings/ints
		Default:	F
timerng		Time ranges, as MJDs or date strings, or [] or F for all
		Allowed:	array of strings/floats
		Default:	F
autocorr		Flag autocorrelations
		Allowed:	Boolean
		Default:	F
timeslot		Flag specific time slots. Specifies center time as MJDs or date strings
		Allowed:	array of strings/floats
		Default:	F
dtime		Tolerance of timeslot parameter, in seconds
		Allowed:	numeric
		Default:	10
clip		Flag values outside a specific range
		Allowed:	Record, see above
		Default:	F
flagrange		Flag values within a specific range
		Allowed:	Record, see above
		Default:	F
quack		Flag VLA quacks - scan interval and quack length, in seconds
		Allowed:	2-element numeric array
		Default:	F
unflag		Clear flags instead of setting them
		Allowed:	Boolean
		Default:	F

Example

- af:=autoflag('3C273XC1.MS')
- af.setdata();
# flag all autocorrelations and VLA quacks
- af.setselect(autocorr=T,quack=[120,60]) 
# flag some frequencies on specific antennas, during a certain period of time
- af.setselect(ant=[1,2,4],timerng="1998/01/20/20:00 1998/01/20/22:00",
               fq=[807.51,807.56])
# flag RR and RL on a few bad time slots on a specific baseline
- af.setselect(corr="RR RL",baseline="3-7",
               timeslot="1998/01/20/20:00:30 1998/01/20/20:20:30")