XS, XE select limits for x-axis of plot. MIN, MAX select limits for y-axis of plot. HIST produces a histogram style plot. GRID produces a full plot grid.
INFO puts additional information about the data on the plot.
OLD uses parameters from previous plot. USER uses axis scaling and labels stored in the FITS header. HARD sends the output to the hardcopy device specified by the TERM command. The index 'sourc' specifies which of the image buffers contains the image for plotting a row or column. The RS and CS keywords are used to display the sum of the selected rows or columns in an image.