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Thanks for getting back to me so quickly Phil.
And thanks for telling me to forget what I've already learned  Seriously, your reply *does* help explain a few things; I'm starting to work through the procedures for paper testing; once I get that done, I'll move on to the film testing.
I've already downloaded the software, and I'll admit it is nifty.
One comment tho: when looking at the analysis for FP4+, the ISO triangle crosses one of the curves; from your definition, this is incorrect placement. Can you explain this? Is there something about the data that causes the software to incorrectly place the triangle? (I'm basing this on page 15, figure 4-13a, 4th edition).
Thanks once again for your comments. I'll let you know how it goes.
-klm.
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