Engine Vacuum vs RPM?

Morning team FABO,

I was under the impression that manifold vacuum dropped lower and lower with increasing Load...which usually goes hand in hand with RPM. (WOT=0 MAP)

I recently saw someone's dyno results claiming that the Vacuum increased with RPM?

like 10 at idle, and 18" at 2500...

am I incorrect in thinking they had this backwards? if not, teach me something :)

Maybe they were recording the numbers with the engine at zero load, but increasing RPM?