Tim,
I'm using 1.1.1 off the CVS tree. I noticed in the
RRDTools graph for "Total Rain Last 2 Days", and some
of the others aren't displaying any reference numbers
in the Y-axis (i.e. inches). Looking at the graph,
there is no ways to tell how many actual inches had fallen.
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I thought this might happen when the graph is a flat line
and the autoscaling picks label values off the chart.
However, I could not duplicate it with RRDtool 1.0.33 and
.35. You might try adding --alt-y-grid to $def and let me
know if it works or not.
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p.s.
I added a number at the bottom of the chart which should be
the total rain shown on the graph (or real close).