CASA Parameter Dictionary

Parameter DescriptionSorted ascending Comments
opacity Apply opacity correction True or False
gaincurve Apply VLA antenna gain curve correction True or False
bptable Bandpass calibration solutions table  
robust Brigg's robustness parameter Options: -2.0 (close to uniform) to 2.0 (close to natural)
cell Cell size [x,y] Units=arcsec
width Channel width (value > 1 indicates channel averaging)
correlations Correlations Options: 'RR','LL','RR LL','XX','YY','XX YY'
fieldid Field index identifier 0-based
standard Flux density standard Options: 'Baars','Perley 90','Perley-Taylor 95','Perley-Taylor 99'
threshold Flux level at which to stop CLEANing Units=mJy
gaintable Gain calibration solutions table
scaletype Image plane flux scale type Options: 'SAULT','NONE'
imsize Image size in spatial pixels (x,y)  
alg Imaging algorithm to use Options: 'clark','hogbom','csclean','multiscale','mfclark','mfhogbom','mfmultiscale'
constpb In Sault weighting, the flux scale is constant above this value  
step Increment between channels Used when mode = 'channel','velocity'
vis Input visibility file CASA MeasurementSet on disk
verbose List each observation in addition to summary True or False
gain Loop gain for CLEANing  
minpb Minimum primary beam level to use  
highres Name of high resolution (interferometer) image  
fitsfile Name of input UV FITS file  
lowres Name of low resolution (single dish) image  
imagename Name of output image(s) For clean and mosaic, this will be appended with .residual, .model and .image
outputvis Name of output visibility file (MS)  
fluxtable Name of output, flux-scaled calibration table  
mask Name(s) of mask image(s) used for CLEANing  
nchan Number of channels to select Used when mode = 'channel'
niter Number of iterations Set to 0 for no CLEANing
tau Opacity value to apply if opacity = True
msselect Optional subset of the data to select (field, spw,time,etc) See: http://aips2.nrao.edu/docs/notes/199/199.html
caltable Output calibration table  
subplot Plot option for multi-panel ploArEtting subplot=yxn, where y=number of y panels, x=number of x panels, n=panel number for the current display starting at the top left
fitorder Polynomial order for fit  
xaxis Quantity to plot on the xaxis Options: 'azimuth','baseline','channel','elevation','hourangle','parallacticangle','time','u','uvdist'
yaxis Quantity to plot on the y-axis Options: 'amp','phase'
channels Range of channels to fit  
refant Reference antenna  
reference Reference field name (transfer flux from)
rmode Robustness mode Used for weighting = 'briggs'
gainselect Select subset of calibration solutions from gaintable  
timerange Select time range for subset of data timerange='YYY/MM/DD/HH:MM:SS.sss'
timerange='< YYYY/MM/DD/HH:MM:SS.sss'
timerange='> YYYY/MM/DD/HH:MM:SS.sss'
timerange='ddd/HH:MM:SS.sss'
timerange='< ddd/HH:MM:SS.sss'
timerange='> ddd/HH:MM:SS.sss'
solint Solution interval (sec)  
fluxdensity Specified flux density [I,Q,U,V] in Jy  
spwid Spectral window index identifier 0-based
start Start channel (0-relative), velocity Used when mode = 'channel','velocity'
stokes Stokes parameters to image Options: 'I','IV','IQU','IQUV'
freqtolerance Tolerance in frequency shift in naming spectral windows  
transfer Transfer field name(s)  
mode Type of data selection Options: 'none','channel','velocity'
fitmode Use of the continuum fit model Options: 'subtract','replace','model'
  Used by:
  Used in:
  Used in:
  Used in:
  Used in:
  Used in:
  Used in: **
  Used in: bandpass, clean, contsub, correct, flagautocorr, fluxscale, gaincal, importarchive, importasdm, importuvfits, invert, listhistory, listobs, mosaic, plotants, plotxy, setjy, split
  Used in: bandpass, clean, contsub, gaincal, invert, mosaic
  Used in: bandpass, clean, gaincal, invert, mosaic, split
  Used in: bandpass, clean, gaincal, invert, mosaic, split
  Used in: bandpass, clean, gaincal, invert, mosaic, split
  Used in: bandpass, contsub, gaincal
  Used in: bandpass, correct
  Used in: bandpass, correct
  Used in: bandpass, correct, gaincal
  Used in: bandpass, correct, gaincal
  Used in: bandpass, correct, gaincal
  Used in: bandpass, correct, gaincal
  Used in: bandpass, fluxscale, gaincal
  Used in: bandpass, gaincal
  Used in: clean, feather, mosaic
  Used in: clean, invert, mosaic
  Used in: clean, mosaic
  Used in: clean, mosaic
  Used in: clean, mosaic
  Used in: clean, mosaic
  Used in: clean, mosaic
  Used in: clean, mosaic
  Used in: contsub
  Used in: contsub
  Used in: contsub
  Used in: correct
  Used in: feather
  Used in: feather
  Used in: fluxscale
  Used in: fluxscale
  Used in: fluxscale
  Used in: importarchive
  Used in: importarchive
  Used in: importuvfits
  Used in: listobs
  Used in: mosaic
  Used in: mosaic
  Used in: mosaic
  Used in: plotants, plotxy
  Used in: plotxy
  Used in: plotxy
  Used in: plotxy
  Used in: plotxy, split
  Used in: setjy
  Used in: setjy
  Used in: split
  Used in: split
  Used in: split
timebin Value for time averaging '-1s' indicates no averaging
bandname VLA frequency band Options: '4','P','L','C','X','U','K','Q'
weighting Weighting to apply to visibilities Options: 'natural','uniform','briggs','radial',superuniform'
datacolumn Which data set column to use Options: 'DATA'(raw),'MODEL_DATA','CORRECTED_DATA'

-- JosephMcMullin - 21 Sep 2006
Topic revision: r4 - 2013-02-13, PatrickMurphy
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