Documentation on uvcheck

Task: uvcheck
Purpose: Check uvdata selection and uv-variable values.
Categories: uv analysis, checking, flagging

        UVCHECK is a Miriad program to check the uvdata.
        The default is to read through the selected uvdata and report the
        times when the source, freq, or number of channels change. 
       The number of records read and the uv and date range are listed.
       The range of values and statistics of a selected variable can 
        also be listed. Uvdata may be flagged directly if a variable is 
        out of range or the amplitude of a reference channel is out of range.

Key: vis
        The input visibility file. No default.

Key: select
        This selects which visibilities to be used. Default is
        all visibilities. See the Users Guide for information about
        how to specify uv data selection.

Key: line
        Linetype of the data in the format line,nchan,start,width,step
        line can be `channel', `wide' or `velocity'.
        Default is channel,0,1,1,1, which returns actual number of spectral
        channels. Use line=wide to check number of wideband correlations.
        If the linetype requested is not present it will NOT be listed.

Key: ref
        Reference line for flagging data.
        Allowed values are:
            channel,start,width
           wide,start,width
       with 'start' and 'width' integers
        Default: no reference line.

Key: refamp
       Range of amplitude in the reference line used to set the flags
       of all the data in that record outside this refamp range to the
       value given by flagval.
       Two values, reflo and refhi, must be given.
       Default: 0,0

Key: flagval
       Either 'flag' or  'unflag' the data based on out-of-range refamp.
       Default: none.

Key: var
        Name of uv-variable to check the range of values. Default is none.
        List mean and rms for values of variable within the range.

Key: range
        The min and max values for var. Times and values when var is 
        OUTSIDE this range are listed . The mean and rms are listed
        for values of var INSIDE this range. Default is all data.

Key: log
        The output log file. Default is the terminal.