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Knowledgebase: ALMA Observing Tool (OT)
What is the difference between a source and a pointing in the OT?
Posted by Suzanna Randall, Last modified by Suzanna Randall on 29 February 2016 09:49 AM

A source as defined by the OT is a collection of parameters comprising the source coordinates, its proper motion, radial velocity, and expected source properties (line/continuum peak flux density, line width and polarization percentage). It may have a target type 'Individual Pointing(s)' or '1 Rectangular Field', and contain one or several pointings.

The pointings defined within a source (whether as offset pointings, custom mosaic or a rectangular mosaic) all share the properties of their parent source; the only way in which one pointing differs from the next is the RA and Dec. In particular, they all share the source velocity information and will therefore be observed with the same frequency tuning. If custom mosaic or 1 rectangular mosaic is selected, the pointings contained in a source will be processed to give one overall image. Different sources on the other hand are imaged separately (even if their pointings happen to overlap).

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