I do as well Tom, but really my point was that from paper to paper and from measuring device to device, one would have to do ones own testing as opposed to looking into a database due to the spectral differences in papers and devices.
As I stated, I use pmk as well and it measures well with my process and it is quite accurate but I don't think my data would do Chris a lot of good.
Phil and I had quite the discussion on his feelings about BTZS should be one of understanding. He wanted everyone to know how to do the work themselves. I suggested that since he had such a huge database of work done from so many different films that he could share that with the public and many could use the data without having to go through the pain of the math.
I think what I was trying to say is that it's best to do the testing in ones own environment if it's at all possible. This will remove any variability and give one a good understanding of what is happening in the process.