In many cases, there are numerical quantities of interest in evaluating or classifying output plots.  Any plot command can be followed by the REPORT statement:

REPORT value AS "title"

Or just

REPORT value

Any number of REPORTs can be requested following any plot, subject to the constraint that the values are printed on a single line at the bottom of the plot, and too many reports will run off and be lost.

For instance, we might modify the contour plot of our example plot to say

CONTOUR(Phi) REPORT(k) REPORT(INTEGRAL(Phi, 'blob'))

On running the problem, we might see something like this at the bottom of the plot: