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Basic Information on uvsplit
Task: uvsplit
Purpose: Break a uv data-set into single source, single-band files.
Categories: uv analysis
UVSPLIT breaks an input data-set into a number of output
data-sets, each of which contains a single ``type'' of data.
Generally this means single source and single frequency
band, though this is controlled by some options.
UVSPLIT chooses its own names for the output data-sets. These
are in the form
sourcename.frequency
Where ``frequency'' is the center frequency of the band, in MHz,
rounded to the nearest MHz.
Key: vis
The name if an input uv data-set. No default.
Key: select
The normal uv selection commands. The default is copy everything.
Key: options
This gives extra processing options. Several options can be given,
each separated by commas. They may be abbreivated to the minimum
needed to avoid ambiguity.
nocopy By default, uvsplit copies any calibration tables
present in the input to the output. The nocopy
option suppresses this.
mosaic Typically this option is used when splitting datasets
observed in mosaic mode. UVSPLIT attempts to place all
pointing centres of the source of interest into the one
output dataset. This requires that the field names of
the different pointings be composed of two parts,
separated by an underscore, viz
a_b
Where "a" is common to all field names (typically
a source) and "b" is a field-specific name (typically
a field number). For example field 123 of a mosaic
experiment of the LMC might be called "lmc_123"
The following three options determine which data-set characteristics
result in UVSPLIT generating different output data-sets.
nosource Do not produce new data-sets based on source name. That
is each output data-set can contain multiple sources.
The default is for each output to contain only a single
source.
nofreq Do not produce new output data-sets based on a switch
in frequency. That is each output data-set can contain
frequency switches.
nowindow Do not generate a separate output data-set for each
spectral window. The default is to create a new
output for each spectral window.