The Magarey model

The equation for f(T) doesn't match equation (2) in the Magarey et al. paper.  Also, the exponent for the 2nd term just reduces to 1.

I'm not 100% sure either if the version published in Magarey is correct either, because as written it would imply that only the 2nd term has an exponent.  We would have to go back to the original papers by Yin et al. to confirm.