where nb is in fm and m0 = 1.66 x 10 g. The inverse fit nb (p) is given by x 1 . qixq2 + q3xq4 ( ( . ))
where x = p/m0 and p is in g cm-3. Coefficients pt and qt of the fits (C.4) and (C.5) are given in Table C.2. The difference (p — nm0) is approximated by these equations with the error of a few percent.
It should be stressed that thermodynamics requires Eq. (5.97) to be satisfied exactly. To achieve this, one should not totally rely on the fits (C.4) and (C.5); otherwise thermodynamic consistency will be violated on the scale of fit errors (a fraction of percent). Thus, if p is used as an input, then nb (p) should be calculated from Eq. (C.3). Alternatively, if the input is nb, then, after calculating pfit(nb) from Eq. (C.4) and P(nb) = P(pfit(nb)) from Eq. (C.2), one should refine p(nb) using the relation
nb nbs J„he nb c2 which also follows from Eq. (5.97).
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