One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.
A narrower follow-up, since the general answer is now clear:
Was that from a primary source or from a summary of one?
labquiet_amy said:Practical: whatever you change, write down the date and the reason.
This is where I part company with the consensus forming above. This treats a plausible mechanism as a demonstrated one. Plausible is where you start looking, not where you stop.
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View Resultslabquiet_amy said:Practical: whatever you change, write down the date and the reason.
True, and it depends on a baseline nobody has stated. Without knowing where someone started, the same number can be an excellent result or a disappointing one.
OP back with an update, since a thread like this is useless without one.
For the archive: it took about six weeks rather than the two I expected, and the difference between those two numbers was the whole of my problem.