That's a good theory, and probably part of the problem, but when I run your code the values shown on the x-axis change from 80, 100, 120, 140 in my old code to the values 70 through 138 inclusive, by 4s (70, 74, 78, ..., 134, 138). So it still refuses to let me say that I want the x-axis to have tick marks at 70, 80, ..., 130, 140. It's not clear to me if there's an easy way to do this or if I have to resort to templates, which I'm just learning, or if there is some other method. It just seems like there would be independent and easy commands to specify one set of numbers for the bins and a different set for the values displayed on the x-axis.
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