That link tells you how to add multiple axis to a chart which
is what I'm doing, but unless you want to have two horizontal axis
on the bottom (which looks terrible) or put one on the top and one
on the bottom (which looks awkward), this solution is not very
The problem is that the data ranges for the horizontal are
the same, but the individual timestamps are slightly different,
sometimes off by only a few hundredths of a second.
To attempt to work around this, I merged the two arrays, but
that seemed to mess up the display of the data.
Is there not a way to just draw the second series on top of
the first without having to lock it to the axis? It seems like the
answer is no when using the standard packages. But is there a way
to override this and get it to draw properly?