Hello,

I am using mtext to write some text below a graph:

plot(1)
mtext("foo", side = 1, line = 2, at = seq(0.6, 1.6, 0.2))

I would like to draw something near the "foo" texts, for example a segment.
For this, I need to know the coordinates of the text ploted by mtext
function.

I spent a few hours to try different combination, using the option xpd =
TRUE and trying to convert between graphics coordinate system using
grconvertX and grconvertY... But I can't make it.

Is there a way to know the coordinates of the text produce by mtext,
particularly vertical coordinates? For example, how can you draw some
segments to underline each foo in my example?

Thank you very much for any help.

david

	[[alternative HTML version deleted]]

