Hi all,

I am trying to do something simple, but which is deviling me. I want to add an 
up-arrow to the x-axis, pointing to a specific location on the axis. I want the 
arrow to be as large as possible.

Here is where I'm at with my code:

#this part if from the ?plot example:
require(stats)
plot(cars)
lines(lowess(cars))
#I am trying to use mtext to add the arrow... but I don't know how to do it:
mtext("?", side = 1, line = 0, at = 7)
#that question mark is a place-holder for the arrow. How do I put an up-arrow 
there instead of the question mark -- as large as possible?

Many thanks to all of you in advance.
-----------------------------------
Josh Banta, Ph.D
Center for Genomics and Systems Biology
New York University
100 Washington Square East
New York, NY 10003
Tel: (212) 998-8465
http://plantevolutionaryecology.org



      
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