A line is always a series of points, and a plotted line must go through those points. If you want to draw a line through different points in one day: that line represents the trajectory through those points in the day, so you cannot draw only once, if you want to plot a line. You may have to clarify better what you mean.
You either want to draw a line or you want to draw a point: it is impossible, in an absolute sense, to do both.

). Certainly a little frustrating for me, but I will keep working it.
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