Implementation Note: We formulated B-17 with 0.64b
w
– 0.64 instead of the simple equivalent
(0.29) because this allows band broadening corrections to be turned off by setting b
w
to 1. When
b
w
=1, h(α
c
) = 1 everywhere. Also, to avoid computational problems (underflows, overflows, and
division by zero) we constrain the argument α
c
when computing h(α
c
) to be
B-18
is typically equivalent to about 600 ppm.
Appendix B
Appendix B. Equation Summary B-7
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