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Default Polynomial Curve Fit

I'm trying to do a polynomial curve fit (order 2) for the data below, but the
equation that the curve fit provides is way off. Any ideas why this isn't
working? It works for a similar set of data...

x y
10600 250
10600 250
10250 300
9750 350
9250 400
8625 450
8000 500
6750 550

 
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