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The bandpass in which the measurement is made must be identified.
The bandpass name is recorded in a column labelled BAND.
(This name, combined with the information in the instrument file, is used to
identify the detector in multichannel instruments.)
Standard passband names should be used:
'V', 'B', 'U', 'URL', 'R', 'I', 'u', 'v', 'b', 'y', 'betaW', etc.
These should agree with the notation used for standard indices for the
standard stars (see section I.2, above, which
describes standard-star table files).
Standard band names are also listed in subsection I.5.3,
``Passbands''.
For DARK measurements, a digit must be appended to indicate the
detector number, if more than one detector is used: DARK1, DARK2, etc.
If red leaks are measured for two or more passbands, they must be plainly
marked; e.g.,
'URL', 'BRL', etc.
If ``neutral'' filters are used to measure nonlinearity, as is often done
with pulse-counting systems, the appropriate suffix
'ND' (for a single attenuator), or
'ND1', 'ND2', etc., should be appended to the BAND value.
Often a filter position is carried in the original data as a code.
Such information must be decoded to a standard band name
in the observation-table file.
The decoding information is normally found in the instrumental table file.
Next: Timing information
Up: Required observational data
Previous: What was measured?
Petra Nass
1999-06-15