I finally found my last problem with the interpolation.
There were two. But last one was the most vexing.
It was my calculation of
fp seconds from datetime.timedelta. I had put this off in its only routine
and had written: dt.seconds + dt.microseconds * exp(-6). Obvious when you
see it: exp is exponent of base e not base 10. The correct expression
is: dt.seconds + dt.microseconds * 10**(-6).
I really like the Python matplotlib plotting routines and interface for
viewing, As you can see, I was able to pinpoint my problems thanks to the
ease of this interface and its ability to create images.
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