Figure 5.

The same function’s Q mapped onto $\delta$-space as in Figure 4, viewed from a different angle. Q is constrained to a plane in $\delta$-space. This plane, highlighted in red, contains the $\delta$-coordinates of the function f (indicated by the red dot) as well as the line$({\delta }_X={\delta }_Y,{\delta }_Z=1)$ (indicated by the solid red line).