how funciton "expression" produces subscript

See ?plotmath for the answer to your question and many more regarding math
expression drawing.
It might be worth printing this help page for future reference.

-Christos 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Jing Yang
Sent: Tuesday, April 18, 2006 10:24 AM
To: r-help
Subject: [R] how funciton "expression" produces subscript

Dear R-users,

does anyone know how funciton "expression" produces subscript?

Best,Jing