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The Rectangular Field option is a convenient way to easily set up evenly sampled rectangular mosaics on a per-source basis. You simply specify the size of the field as p length times q length, the Position Angle and the Spacing of individual pointings. By default, the spacing is set to Nyquist sampling (Spacing = 0.48113 times fraction of main beam). If you change this, you must carefully justify your choice in the Technical Justification (Step 3.9). For rectangular fields, the 7-m Array pointings are automatically set up to optimally sample the area specified, therefore the number of pointings will be smaller than for the 12-m Array. You may wish to export the coordinates of the individual pointings; this is easily done using the Export button next to the displayed number of pointings.