Removes pixels with large errors from an NDF
"Sigma"
for a
standard deviation, "Variance"
for variance, or "SNR"
for minimum signal-to-noise
ratio. ["Sigma"]
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.
For MODE="SNR"
the comparison is with respect to the absolute data value.
This routine correctly processes the AXIS, DATA, QUALITY, VARIANCE, LABEL, TITLE, UNITS, WCS, and HISTORY components of an NDF data structure and propagates all extensions.
Processing of bad pixels and automatic quality masking are supported.
All non-complex numeric data types can be handled. The output NDF has the same numeric type as the input NDF. However, all internal calculations are performed in double precision.