with h being the measured
location of the highest-field resonance peak from an arbitrarily selected
fixed reference point. Traditionally, the sigmoid function for
THCM has been defined in terms of three parameters, with the fourth
parameter, cs, fixed at one. The motivation behind including cs as an
additional parameter is to generate a tight fit between THCM and h
vs. p curve for a wide range of Bm. The shape of h vs. p curve changes
significantly with Bm, with smaller Bm generating larger growth