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1 Quality values
QUALITY is stored in an 8-bit unsigned byte, where each bit gives a
separate description of the quality of the associated data value. The
meaning of each bit in ASTERIX is as follows:
Bit Meaning
0 bad - unspecific bad quality
1 missing - no data value at this point
2 arith - arithmetic fault, eg. / by zero
3 *** not currently used ***
4 *** not currently used ***
5 *** not currently used ***
6 patched - indicates data patched/interpolated
7 ignore - used to temporarily exclude points
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