Whilst looking at the different tables in MEMS3 ECU's this one stood out like a sore thumb!
This is the same table, from three VVC ECUs with the same firmware version:
A lot of ECUs seem to have something similar to the last one. But there seems to be little logic or pattern to the others. And here is the same table (identified because it's in about the same position in the list of tables and is the only one to have X axis values 0..5) from three non-VVC ECUs:
Again, no apparent consistency between them at all!
I have no idea what the axes are.
X axis 0..5 could be gears (with neutral) so I was thinking maybe gear shift light data, but I can't find any evidence that MGs and Rovers of the era had them, and given that Rover apparently reprogrammed the aircon to come on a set RPM for Caterham, end then drove the dash shift light off the aircon clutch solenoid output, I doubt they would have gone to those lengths if there was a shift light facility already that could have been remapped.
I thought maybe auto gearbox shift data, and maybe it was just there but without sensible data in manual ECUs, but the Rover Steptronic was continuously variable so it doesn't seem like a good fit there either.
I suspect it's not of great interest for remap purposes - if it was critical some of those cars would drive like a bag of spanners.
But it's a puzzle and I wish I knew the answer.