Just hoping you are open to learn something, take a look at the following graph (just random from google):
On the left side you see Celsius, on the right side you see Fahrenheit. The curves are valid for both scales. Conclusion, the shape of the curve is independent of the used units, and only depends on the chosen range and aspect ratio.
I hope this will contribute to you understanding of reading graphs.
edit on 6-12-2010 by -PLB- because: (no reason given)