I'm endeavouring to make a graph similar to the following using PgfPlots and TikZ.

I can make all of this work, except for the placement of the R=2, R=3, R=5, and R=10 markers on the left-hand side.
It would be nice if PgfPlots could place these automatically - any thoughts as to how? Alternatively, how could they be placed manually?
Thanks!
node [pos=0] {$R=2$}at the end of your\addplotcommand. By default, they'll be clipped away, though, so you'll have to addclip=falseto theaxisoptions. – Jake Jul 18 '12 at 20:47