class-associated-arrays

IRAM Memo 2015-4
Introducing ASSOCIATED ARRAYS in CLASS
S. Bardeau, J. Pety
1. IRAM (Grenoble)
2. Observatoire de Paris
November, 26 2019
Version 1.3

### Abstract:

The concept of ASSOCIATED ARRAYS is being added in the CLASS data format. It is an additional section that will store a set of data arrays whose spectral axis matches the brightness spectral axis, i.e., one-to-one channel correspondance. At start, this will be used in two contexts. For Herschel/HIFI, it will store a logical array of blanked channels and a logical array to define the channels where the lines appear (see IRAM Memo 2015-3). At some point, it will be used at the IRAM-30m to store the results of the calibration scans, i.e., the sky counts in the RY array and the hot/cold counts, and the receiver, system, and calibration temperatures in a set of ASSOCIATED ARRAYS.

This document introduces the detailed specifications of the concept of an ASSOCIATED ARRAY, its implementation/integration in CLASS, and it gives an example of use, namely how to baseline a spectra using a LINE associated array to define the baseline windows. The specifications of the ASSOCIATED ARRAYS is foreseen to evolve following feedback from its use at IRAM and elsewhere.

Keywords: CLASS Data Format

Related documents: CLASS documentation, Importing Herschel-FITS into CLASS

- Contents
- Nomenclature reminder
- Specifications
- Implementation details
- RESERVED ASSOCIATED ARRAYS
  - Pre-reserved array names
  - Reserved arrays
    - W
    - BLANKED
    - LINE
- Generic integration in CLASS
- Evolution
- ASSOCIATED ARRAYS section example
- About this document ...