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This graph is very confusing. On the X-axis are dates, and on the Y-axis are some unspecified numbers, perhaps price.

X-axis = dates (Jan 1st - Dec 31st)

Y-axis = price

So all the On-Demand instances were free on Jan 10, and have been getting more expensive linearly since then? I doubt it.

If you zoom in to see Jan 10th 2010 you will see the following prices

So x-axis is actually days of usage, not absolute dates

Correct day 1 to day 365.