See also documentation for subroutine selprobe(), which may very well differ slightly from this document.
time(t1,t2)Select data between times t1 and t2 (UT). Times are in the format:
yymmmdd:hh:mm:ss.sVarious abbreviations are possible. If no date part is given, then the time matchs all data (regardless of its date) for the given time of day. e.g. time(03OCT30:05:41:08,03OCT30:05:43:09)
antennae(a1,a2,...)(b1,b2...)Select all baselines pairs formed between first and second list of antennas. The second list is optional and defaults to all antennas.
uvrange(uvmin,uvmax)Select visibilities with uv radius between uvmin and uvmax (in kilo wavelenghts). If only one value is given, uvmin is taken as zero.
uvnrange(uvmin,uvmax)Select visibilities with uv radius between uvmin and uvmax (in nanoseconds). If only one value is given, uvmin is taken as zero.
visibility(n1,n2)Select visibilities numbered n1 to n2 inclusive.
increment(inc)Select every inc'th visibility.
ra(r1,r2)Select visibilities whose RA is in the range r1 to r2. RAs are given in the format
hh.hhhVarious abbreviations are possible.
dec(d1,d2)Select visibilites whose DEC is in the range d1 to d2. Declinations are given in the format
dd.dddVarious abbreviations are possible.
ha(h1,h2)Selects on hour angle (values in decimal hours or hh:mm:ss)
lst(lst1,lst2)Selects on LST (values in decimal hours or hh:mm:ss)
elevation(el1,el2)Selects on elevation (values in degrees)
dra(p1,p2)Select visibilities for which the RA of the pointing center is offset from the main pointing center by between p1 and p2 arcseconds.
ddec(p1,p2)Select visibilities for which the DEC of the pointing center is offset from the main pointing center by between p1 and p2 arcseconds.
dazim(p1,p2)Select visibilities for which the DAZIM offset is between p1 and p2 arcseconds.
delev(p1,p2)Select visibilities for which the DELEV offset is between p1 and p2 arcseconds.
pointing(p1,p2)Select visibilities with the rms pointing error in the range p1 to p2 arcseconds. If only one number is given, p1 is taken as 0.
polarization(p1,p2,p3,...)Select visibilities on the basis of their polarization/Stokes parameter. p1,p2,p3,... can be selected from "i,q,u,v,xx,yy,xy,yx,rr,ll,rl,lr" Conversion between polarizations Stokes parameters (e.g. convert linears to Stokes) is not performed by this mechanism (see keyword stokes).
source(SRCNAM1,SRCNAM2,...)Select correlations from the particular source. Several sources can be given. An asterisk in the source name is treated as a wildcard. Note that the sourcename match is done IGNORING CASE.
purpose(TYPE)Select based on the intent/purpose of the observation. Introduced in CARMA, where the letters B (bandpass), F (fluxcal), G (gaincal), P (polarization), R (radio pointing), S (science) and O (other) are used. Multiple letters from this set can be chooses. No wildcards allowed.
seeing(r1,r2)Select on seeing monitor rms path length (in microns). The UV variable used is smonrms for ATCA, rmspath for CARMA
frequency(f1,f2)Select correlations, where the sky frequency of the first correlation is in the range f1 to f2 (in GHz). If only a single frequency is given, then correlations are selected if the first correlation is within 1% of the given frequency. Note this selects the whole record. This may include several spectral-windows whose frequency is quite different from the first correlation in the first window.
amplitude(amplo,amphi)Select any correlation, where the amplitude is between "amplo" and "amphi". If only one value is given, then "amphi" is assumed to be infinite.
shadow(d)Selects data that would be shadowed by an antenna of diameter "d" meters. If "d" is zero, then the actual diameter of the antennas (if known) is used. If some data is shadowed, it is advisable to use an antenna diameter value greater than the physical antenna size (e.g. 20% larger).
bin(b1,b2)Select visibilities which have pulsar bin numbers in the range b1 to b2 inclusive. If b2 is omitted, just pulsar bin b1 is selected.
on(n)This is used with single dish observations, anbd selects based whether the "on" variable in the data is on (1) or off (0).
autoThis is used with files that contain a mix of autocorrelations and crosscorrelations. This selects just the autocorrelation data.
window(w1,w2,...)Select by spectral window (IF band in AIPS terminology). See the help on window for more information.
orThe list of subcommands before and after the 'or' are "ored" together.
andDefault ??? Default: all data selected.