Hi all, I am using the the calculate "Area and Volume" option in Chimera to estimate the SASA and excluded volumes of a family of fullerene materials. I need to calculate the area and volume using two different probe sizes (1.4 and 2.0, to be specific). For most of my particles, you see that the volume and area are relatively insensitive to a change in probe size (which I would expect). For one particle, however, I find the results to be quite different and unintuitive. For instance: 1.4: Area: 1174 Volume: 3534 2.0: Area: 1692 Volume: 2493 My (perhaps wrong??) assumption is that the area calculator uses a Connolly algorithm. If that is the case, I can't understand why a larger probe would give a larger area (smaller probes samples more surface). Also, why would a larger probe give a larger volume? Again, I thought the volume calculator used a Voronoi algorithm, which, to me seems independent of probe size. Any idea what may be wrong about my understanding? I've attached a .pdb of the molecule in question if you'd like to take a gander. Thanks in advance! ~Patrick