anders_CPH said:The mechanism and the magnitude are separate questions.
Coming at anders_CPH’s question from a different direction. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.
The figures, for anyone assembling their own picture. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.
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Shop Reference StandardsOne thing that is still open after anders_CPH’s answer:
Was that from a primary source or from a summary of one?
OP back with an update, since a thread like this is useless without one.
Reporting back for the archive rather than for the thread: I did the narrow version of what was suggested, gave it the full interval, and it settled. Posting it because threads without a follow-up are half a thread.