That may well explain why the "Beam Points" are not available in the file.
Data error messages come up trying to read the file. The individual GXT files have the beam points I believe.
I did see that there are 76 TPN's available in the 46 Spotbeams.
Spots are A01 to A22 and B01 to B24.
Most are 2 TPN's per beam (26) but two A06 and A08 have 3 TPN's and 18 including A21 & A22 as well as B21 thru B24 have only 1 TPN
Also 16 National TPN #9 thru 24.
These 16 are replicated twice, once in Hawaii Beam and again in the Puerto Rico Beam.
So are you saying the spots with three tpns are the ones pointed at puerto Rico and Hawaii? Or are they probably so they can be pointed at the areas with the largest number of channels, or maybe simply the biggest dmas that may carry more channels overall because they are so spread out, like say Utah?