...¹

The MAPPING tool was developped by S.Guilloteau and J.Pety (IRAM) within the GILDAS framework.

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... ?²

For users familiar with MAPPING, the question mark replaces the capabilities of the INPUT Command although the output format may be slightly different.

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... Number³

The CLASS/ CLIC is a "radio Julian date" (or "Jansky Julian date"), which starts as \(-2^{15}\) on the date of the first radio observation by Karl Jansky. It is thus the Modified Julian date minus 60549. That choice was made to maximize the time interval over which radio astronomical data could be usefully stored in an integer*2, back when 2 bytes of header space per spectrum were a significant consideration. This date has little meaning outside the rather sparse community of souls gathered around the CLASS and CLIC programs, however...

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...casagildas ⁴

This tool is made available to CASA by IMAGER ( IMAGER does not need to be active, but must have been executed once before)

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... unpolarized⁵

unless the /STOKES option is present, see Section 15

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... beam⁶

It is also theoretically possible to do so with an intensity truncated beam.

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... image-mosaic⁷

Jan-2023: No provision for SAULT method yet in this script. Take it as a template and modify to your needs.

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... methods.⁸

Currently, the dirty and primary beams are expanded to the Sky mosaic size at the end of the SAULT method, thus limiting the gain that could also occur during the deconvolution. In principle, this is not needed at all for the dirty beams, as CLEAN can handle different Dirty Beam and Map sizes. For Primary beams, it would require carrying on the pixel shifts between the Primary beams and the Sky map size.

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... intensities.⁹

This format is subject to change: Please, refer to the TABLE documentation for up-to-date information

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... antennas¹⁰

If there were no pointing errors, a single-dish of the same size as the interferometer antennas would be strictly sufficient.

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... fit¹¹

this is probably too much, and would most likely lead to instability in the model fitting !..

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... almost...)¹²

The combination is only optimal if the spectral index is zero. Handling a spatially constant spectral index would be readily possible ( it is even straightforward in the equivalent loop). Spatial variations of the spectral index pose a different challenge, and need to produce both a brightness map and a spectral index map. This is currently under study. See also 11.4

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... processing.¹³

Conceptually, it would be easy to implement this in an automatic way in the ORGANIZE step, usinq some naming convention for the file storing the proper motion information.

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... frame¹⁴

ultimately, a similar DD, SS, DS and SD pseudo-Stokes polarization set may be added for circular polarization. D is the first letter for Dexter, the Latin name for Right, while S is the first letter of Senester, the Latin name for Left.

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... configurations¹⁵

to make things worse, different proper motions can be used on different pbserving sessions.

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