I I remember correctly Settefield collated all historical estimations for C regardless of their age experimental methodology or accuracy of error bands. He then, almost without exception, took the upper limits of the error bands and some very old and wildly wrong guesstimates and produced a curve that suggested an exponential fall off from roughly 7 days after creation (where C remains suspiciously constant) to a steady flat state round about the time C started being measured by atomic clocks. How convenient it is that C reached a steady state round about the time we developed the tech to accurately measure it.
Basically it was the typical creationist's game of taking spurious data and bending it till it gives the desired result.
The ironic thing is that the data that the attomic clock testing is giving us actually produces data that seems to show an increase in C, though this slight increase does seem to lie within the margin of error, and thus must be written off as experimental error. (don't remember where I read that , but I found it interesting.)
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