Fig. 4.
The density-independent contribution to the PMFT for cubes at distances of (A), 1.2 (B), and 1.3 (C), which arises intrinsically from the pair of colloids under consideration and contributes the first term factor on the right-hand side in Eq. 6. This contribution provides an effective repulsion between free particles, which is stronger at small separations (A) than at larger ones (B and C). The pattern of the repulsion is opposite that of the overall PMFT between cubes seen in Fig. 3, in which both factors in Eq, 6 have been taken together.