The LWS data products for AOTs L01, L02 and L04 have been
Quality Checked. This was to ensure that no corrupted data is distributed.
The quality check was performed
at three levels.
Level 1
Here the OLP operators checked the products of the
processing for obvious errors like:
Instrument failures or telemetry drops during the observation
Absence of a spectrum
A non-physical (i.e. negative) spectrum
A flat spectrum (i.e. all values equal)
If an anomaly was detected at this level, it was passed to Level 2
Level 2
Here the instrument team investigated whether the
failure was due to an instrument
failure, or a peculiar behaviour of the instrument and decided
if the observation was still scientifically valid.
If this was not
the case the observation was passed to Level 3.
Level 3
Here the astronomers in the ISO team investigate
whether the observation needed to be rescheduled (when ISO was still in
operation !), or whether the
observation would most likely fail again (for instance due to
very high backgrounds, or proximity to a very bright source).
The data observers got for the AOTs L01, L02 and L04
should therefore not contain
any obvious errors (as listed above). For LWS the products
of AOT L03 (FP wavelength range) have not been scientifically validated
and have therefore not been Quality Checked.
