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2 Masking quality
To determine whether a data point has bad quality, its QUALITY value
is compared with a MASK and if any bit is set in both QUALITY and MASK
then the overall quality is considered bad. By default the MASK is taken
as 11111111, so any bit set in QUALITY will give bad overall quality.
It is possible to attach a different MASK to a dataset (eg. by using
the MASK command) and for this MASK to then be used to determine
quality. For example, if some data points have been temporarily
excluded by using the IGNORE variant of the QUALITY command, they could
be switched back in by setting the MASK to 01111111, rather than by
resetting all the QUALITY values with RESTORE. Setting the MASK to
00000000 will give all points good quality.
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