In our view, it is very bad practice to substitute plain-English names for numerical thresholds, 95 because it encourages users to remain oblivious to numerical settings that may be important. An occasional criticism of commercial software is that algorithm details may be proprietary, but in our view that criticism should be leveled against scientific writing (and reviewing), not against software per se. To wit, the ORCA user manual suggests that some aspects of the internal PNO truncation scheme are intentionally undocumented. In the present work, we explore MP2 calculations us-