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It is reminded that:
- A CLASS observation is used to store and retrieve a flux array
for analysis into CLASS. This flux array is called RY hereafter.
- In a CLASS observation, there are 3 ways to define the X axis
associated to RY:
- the spectroscopic section for regularly sampled (in frequency
and velocity) spectroscopic data,
- the drift section for regularly sampled (in time and angular
position) continuum drift data,
- the so-called "X coordinate section" for irregularly sampled
spectroscopic or continuum drift data.
One of these 3 sections is used to define the RX array describing
the X axis associated to RY. In the cases (a) and (b), RX in memory
is built so that it has as many values as RY. In the case (c), the
CLASS Data Format ensures that RX has as many values as RY. For
simplicity hereafter, we call RX the X axis coming from one of these
sections, and Nchan its number of values.
Gildas manager
2023-06-01