The plot area, in blue. Only a few combinations are excluded, namely any parameters against itself. The display options area in grey, to the right of the display area, offering a large number of options that influence the display. In the function selection area 10 buttons, marked as 'vs.' on the bottom row, offer possible choices for the x-coordinate. These choices seem to be self-explanatory enough, just read 'chi' for 'kappa' if you use Eulerian angles.
Most choices seem self-explanatory enough.
BckgRat is the ratio of the background counts in the original scan, and is defined as the largest divided by the smallest. Shift the viewframe to the right. By pressing the left, the middle or the right part of the button, the viewframe is shifted by one third, one half or one whole viewframe. Default is 2 pixels per step. By pressing the left part of the button the step size is decreased, by pressing the right half of the button the size size is increased.