When doing configuration studies, if key S is pressed, SCHED will calculate the array quality measure for points on a grid in latitude and longitude centered on the first highlighted (red) station. It is best to only highlight one. Then labeled contours will be plotted over the region of the calculation. Note that the contours are not cleared until the uvcoverages are plotted, so you can end up with several. The contours are reploted (including to an output file) until some action like altering a any station's selection status or moving a station is done. The spacing of grid points in latitude and longitude for calculating the quality is given in arcminutes by GRIDSTEP.