The sensitometer used for this tests is a green x-ray sensitometer.
Unfortunately, this makes the results of different films (but not 
developers!) incomparable... the densities recorded show the sensitivity 
at a very narrow (+/- 10nm) green part of the spectrum. To compare real 
sensitivity between different films, a sensitometer with white light must
be used, so this data is only useable to compare different developers 
and processing for one film at a time.

Martin Jangowski, 4.2004