The TEM is the current in-hex TEM the unit would use in an attack, i.e. +2 for foxhole, +1 for vehicle/wreck, etc.
I don't know to which instance of the table you refer but the current version in the body of the rules under A12.122 says "Location" not "hex". Your page A35 should be "(c) 2000 Multi-Man Publishing, LLC" to be up-to-date.
JR