Figure 4.

An example mapping of the Bertschinger set Q to $\delta$-space for a randomly chosen function f. A set Q consists of all probability distributions $p(X=x,Y=y,Z=z)$ that share the same marginal distributions $p(X=x,Z=z)$ and $p(Y=y,Z=z)$. Each Q maps onto a set of points with a complex distribution, but which is constrained to a simple plane in $\delta$-space.