Blindingly obvious trick when optimising figure positioning

[Steve Rickaby]

Blindingly obvious possibly, but it's taken me a couple of decades to think of it.

When optimising figure positioning to move figures as close to the cross-references to them as possible, temporarily add color to the figure xref format to make them show up.      (Duh!...)

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Steve [Trim e-mails: use less disk, use less power, use less planet]