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Occasionally data does not fit a hyperbolic curve very well.
Two other simple fitting functions are
Equation (3.34) has an extra adjustable parameter
of no simple interpretation other than the beginning of a power series in .
I prefer Equation (3.35) where the extra adjustable parameter
is a time shift which has a simple interpretation,
namely, a time shift
such as would result from a near-surface low velocity layer.
In other words, a datum correction.