I have how-to on how to find the location of maps in the NNN series Td5 ECU's up on my blog that might be of use to someone.
There is no information about the purpose of the tables, but the how-to identifies where the index to the individual maps is located and how the tables are structured, and explains how to use this information to define a map in Tuner Pro.
http://www.discotd5.com/ecu-reverse-eng ... ps-td5-ecu
cheers
Paul