In this case, you can define just one evenly sampled rectangular field mosaic with up to 150 12-m pointings per Science Goal (any ACA pointings are counted separately). In addition to the Field Centre Coordinates (set by default to the Source Coordinates), you 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). You can visualise the rectangular area covered as well as the individual pointings in the spatial viewer (see Fig. 3.8). If the ACA is selected in the Control & Performance editor (see Step 3.8), you can switch between the mosaic set up for the 12-m and 7-m antennas by clicking the appropriate Antenna Diameter radio button, and the area scanned by Total Power observations will be shown by a turquoise box. In this case, 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 (e.g. for use in CASA); this is easily done using the Export button next to the displayed number of pointings.