MadMind, I think you need to bone up on the ideas of independent and dependent variables. There generally isn't a good reason to make both variables in a graph independent, which is what you seem to be doing. It makes more sense to pick a price and then have a range of other values for that price, which can be represented in many graphing programs using error bars.
If you try to put error bars on both sets of data, it really muddies up the dependence of one variable on the other. Suit yourself, of course.
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Does anyone use a graph program that easily makes pretty graphs? It doesn't have to be free. I am just sick of how Excel makes graphs look. I would prefer something that works on OS X. I do run Windows on Mac, too, so that isn't a deal killer.
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