The "Domain" window opens with a gray domain and r-theta, r-z, and theta-z slice surfaces in the domain.  These are colored cyan, magenta, and orange respectively, and are determined by moving the cyan hotspot.

The "Graph of RZ-Slice", "Graph of RTheta-Slice", and "Graph of ThetaZ-Slice" windows plot the image of the slices refered to in the domain under the function.  These surfaces are colored according to the value of the function.

The "All Slice Surfaces" window shows the same slices from the "Domain" window colored according to the value of the function.