This file describes the values of the DATA_QUALITY_ID keyword in the 
SOIR data labels.
(written by A. MAHIEUX)

DATA_QUALITY_ID is a 8 bit binary code. Each digit in the code can be
set to 0 or to 1.

The first four bits correspond to error issues. Errors concern
measurements for which the results are wrong, due to incorrect 
telecommand or wrong behaviour of the instrument.

The last four bits correspond to warning issues. Warnings are issued 
when: 
1- Detector saturation occurs (ex: too long integration time)
2- The full Sun spectrum can not be corretly defined. The full Sun 
spectrum is used to calculate the transmittance. It is obtained 
considering the spectra taken at high tangent altitudes. It has been 
decided that at least 40 spectra have to be taken before reaching a 
tangent altitude of 220 km. If it is not the case, different options 
are considered, as summarized in the table below. The corresponding 
warning is issued.
3- The full Sun regression spectrum is hard to define, from numeric 
problems for example.

The codes are defined as following:

Case      | Description
----------+---------------------------------------------------
0000 0000 | No problem, no warning, occultation usable
----------+---------------------------------------------------
0001 0000 | Error: No telecommand received
0010 0000 | Error: Detector temperature problem: too high
0011 0000 | Error: Any other kind of error
----------+---------------------------------------------------
0000 0001 | Warning: Detector saturation
0000 0010 | Warning: 40 points above 200 km
0000 0011 | Warning: 30 points above 200 km
0000 0100 | Warning: 20 points above 200 km
0000 0101 | Warning: 20 points above 180 km
0000 0110 | Warning: 20 points above 160 km
0000 0111 | Warning: 20 points above 140 km
0000 1000 | Warning: 20 points above 120 km
0000 1001 | Warning: 20 points below 120 km
0000 1010 | Warning: Very bad definition of the Sun regression