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Originally Posted by Jason
Yes, I know. I'll look into how to do that, but it's a little harder than you'd think. They're on different scales.
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Jason,
I think I understand your comment. I'm a pretty bad programmer, so take the following fwiw:
Rather than trying to make a single graph with two scales, let the DB build up a repository of graphs that are subsets of temperature and trip. So for example, all tanks that are 15 minute trips at 30 degrees would be one graph, broken down into bars that represent each car type. The user picks a data subset, and gets the corresponding graph.
Hope that helps explain what I am thinking about.