application produces a copy of the input NDF
in which pixels with errors greater than
a specified limit are set invalid in both DATA and VARIANCE
components. The error
limit may be specified as the maximum acceptable standard deviation (or variance), or
the minimum acceptable signal-to-noise ratio.
errclip in out limit [mode]
IN = NDF (Read)
The input NDF. An error is reported if it contains no
LIMIT = _DOUBLE (Read)
Either the maximum acceptable standard
deviation or variance value, or the minimum acceptable signal-to-noise ratio (depending
on the value given for MODE). It must be positive.
Determines how the value supplied for LIMIT is to be interpreted:
"Sigma" for a
"Variance" for variance, or
"SNR" for minimum signal-to-noise
OUT = NDF (Write)
The output NDF.
m51_good 2.0 The NDF m51_good is created holding a copy of m51 in which all
pixels with standard deviation greater than 2 are set invalid.
m51_good 2.0 snr The NDF m51_good is created holding a copy of m51 in which all
pixels with a signal-to-noise ratio less than 2 are set invalid.
m51_good mode=v limit=100 The NDF m51_good is created holding a copy of m51 in
which all pixels with a variance greater than 100 are set invalid.
The limit and the number of rejected pixels are reported.
A pair of output data and variance values are set bad when either of the input data or
variances values is bad.
"SNR" the comparison is with respect to the absolute data value.