[O] Break a line in org-mode

[Søren Mikkelsen]

I usually have some #+LaTeX_HEADER: entries in my org-mode files where
some of them are macros. These lines can be rather long so I have to
type in #+LaTeX_HEADER: multiple times for breaking the line to a decent
level.

Is there a way of breaking a line when it is export options (or a
regular comment in org-mode)?

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Søren Mikkelsen