Hi R users,

The margin parameter mar is measured in unit of lines, the size of which is
automatically adjusted during plotting. I am wondering how can get the size
of a line and how can I control the margin size by controlling the line
size? (I know I can use mai to control the absolute size of margin, but in
some situations that parameter does not exist. For example, heatmap() only
accept mar as a parameter to adjust the space for the axes labels.) I'd
appreciate any help.

Thanks,
Zech

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