This is the "fused peak" case that Henry sent earlier.  As far as I understand this was the case "p4s0.fvx"-RIGHT (DICOM5)

Again BiCal was applied with the exact parameters as with other cases. Then BiLaplacian with exactly same parameters too.  We see a great histogram split as a result.

Initial fused peaks case resolved.

Corresponding segmentation (top and bottom slices)