Erratum: On page 292, the numerator and denominator are flipped in the
expression equal to (de*/dh).  (Thanks to Ted Miguel for pointing this
out.)  In the several sentences that follow, the "numerator" and
"denominator" refer to what is incorrectly printed for the equation.
A kludge/fix would be to note that the analysis is correct if the
left-hand side of that equation were instead 1 / (de*/dh).
Alternatively, flip the right-hand side of the equation and swap
"numerator" and "denominator" in the paragraph.