Hi Martha, Not that it made too much difference, but you may want to loosen just a bit the tolerance to the routine. If you notice, it didn't stop at iteration #14 when it probably should have). I'd set that at 7% or so and see if that doesn't get you a slightly more efficient answer. To my eye, the routine overshot just a hair (not enough to be outside the CFZ), but enough to cause a few more iterations than necessary.... I was also a bit surprised that the ramp on the left side was muted. That didn't look quite right to me as I would have expected it to ramp quickly (as quickly as the fall on the far right side).... In any case, these are nits, glad you have it working. CS Doug

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