Modified HTAP2 Tier1 region index by splitting SEA into continental (7) and maritime (18)
 02 = OCN (Ocean)
 03 = NAM (North America)
 04 = EUR (Europe)
 05 = SAS (South Asia)
 06 = EAS (East Asia)
 07 = SEA (Continental Southeast Asia)
 08 = ANZ (Australia + New Zealand)
 09 = NAF (North Africa)
 10 = RAF (Rest of Africa)
 11 = MDE (Middle East)
 12 = CAM (Central America)
 13 = SAM (South America)
 14 = RBU (Russia + Belrus + Ukraine)
 15 = CAS (Central Asia)
 16 = ARC (Arctic)
 17 = ANT (Antarctic)
 18 = MSA (Maritime Southeast Asia)