Rich is quite precise. Let me try to restate: For the purposes of determining hover performance when you have only two charts, an IGE chart and an OGE chart, and an examiner asks you to determine what performance you have, you answer, "Ige at x feet skid height or OGE at any higher hover."
Many military helos have a chart that computes power required for any height, as do some FAA manuals. For these, there are several correct answers, "I don't know" is not one of them!
One nice thing about pprune is that there are lots who want each slant, the "legal" one and the technical one.