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Rectangle
This panel is only visible when ``1 rectangular field'' is selected in the Source panel. Choosing this means that only one source can be defined. The rectangle defines a continuous area that should be mapped by ALMA and will be mosaiced by the 12-m and 7-m arrays and continually scanned by the Total Power array. A maximum of 150 12-m array pointings is allowed.
- Coords Type: Field centre in absolute or relative coordinates. Relative positions are offset from the source coordinate and are recommended (absolute coordinates have not been demonstrated to work at the telescope).
- Field Centre Coordinates (Absolute)
- System: Coordinate System.
- Sexagesimal display?: Check to switch between the coordinates formats.
- RA: The centre coordinate of the rectangle in Right Ascension.
- DEC: The centre coordinate of the rectangle in Declination.
- Field Centre Coordinates (Relative)
- Offset(Longitude): Longitude offset of the centre of the rectangle from the source coordinate.
- Offset(latitude): Latitude offset of the centre of the rectangle from the source coordinate.
- p length: Length of one side of the rectangle.
- q length: Length of the other side of the rectangle.
- Position Angle: Position angle of the ``p'' side of the rectangle from the vertical direction.
- Spacing: Spacing of the data required within the rectangle. Can be specified in arcmin or in fraction of the antenna beam. Nyquist spacing is the default. If Nyquist sampling is not used, the reasons for this should be given in the Technical Justification node.
- Reset to Nyquist: Reset the spacing to the Nyquist sampling.
- #Pointings: The number of pointings calculated by the OT is displayed here, for the 12-m and (if required based on the Control & Performance parameters) 7-m arrays.
- Export: Export the pointings (12-m and 7-m array) to disk.
Figure 5.4:
The Rectangle panel of a Science Goal's Field Setup.
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The ALMA OT Team, 2014 May 21