This is essentially a direct visualizaiton of the Morse-Smale complex. We could try to estimate the size of the parameter space above or below a certain value by estimating the area covered by the graph. The lines that connect the critical points in the graph are estimations of the curvature of the function under examination. Furthermore, the x-axes in the plot do not have any direct coorespondence with the input parameter space. It would be difficult to estimate the area covered above a certain y-value let alone recover the input values that correspond to this.