From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Gauland <mikelygee@amuri.net>
Subject: Re: PNG R plots size
Date: Tue, 17 Dec 2013 20:22:55 +0000 (UTC)
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Vicente Vera <vichovp <at> gmail.com> writes:
> How can I control the size of a PNG graphic? Do I need to tweak
> something inside Org or specify something in R?

I use a line like this:
    
   #+HEADER: :res 300 :units cm :width 15 :height 15

to create a 15cm square PNG at 300 dpi.