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Bob --
The main problem is that the axes of your graph are in different scales; that is, the x-axis values are expanded so that (for example) a 0.3 by 0.3 "square" is really an horizontal rectangle. That discrepancy reduces the gradient of the curves unrealistically. Also, your numbers are not paired according to BTZS convention so that, if plotted as given, the curves are reversed. Finally, it's customary to zero the densitometer on the raw light so that the step tablet densities (x-axis) typically begin with a B+F density of about 0.05 and progress through a total of 21 steps. These flaws would prevent the Plotter from analyzing your test data correctly.
That said, you're not very far off the mark. Although I'm not sure I've plotted the right number pairs, it appears that the test values are valid and the curve family appears quite normal except for the errant 6.5-min curve. If you were to do the test over, using the actual step tablet densities (beginning with B+F as step 1) on the x-axis, and pairing the numbers properly, I think you'd get reliable data.
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