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Data, i.e. observational parameters as well as spectra, is organized in
the following way:
- One observation is self-contained. All the information needed to
reduce it is recorded on the same few disk blocks. It may be one spectrum
or one continuum drift.
- Each observation is divided in several sections, containing header
parameters or data:
- General information (date, times, local coordinates, sequence
number, ...)
- Positional information (source, name, astronomical
coordinates, equinox, offsets, ...)
- Spectral information (number of spectra, line names ans
frequencies, resolutions, number of channels, ...)
- Data
- ...
In the Classic nomenclature, one observation is saved into one
entry in a Classic file. Each entry is composed of an entry
descriptor + the observation itself (header+intensity array). Please
refer to the section The File Entries in the Classic
documentation for details about the way an entry is written in the
file.
Gildas manager
2024-04-18