Keywords: class-associated-arrays

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# Nomenclature reminder

It is reminded that:

1. A CLASS observation is used to store and retrieve a flux array for analysis into CLASS. This flux array is called `RY` hereafter.
2. In a CLASS observation, there are 3 ways to define the X axis associated to `RY`:
   1. the spectroscopic section for regularly sampled (in frequency and velocity) spectroscopic data,
   2. the drift section for regularly sampled (in time and angular position) continuum drift data,
   3. 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.