[R] Sweave: change tab size

[Sascha Vieweg]

When Sweave outputs function code that spreads across many lines, 
the default indent of inner lines is 4 spaces (plus the prompt). 
How can I change that default to 2 spaces? I tried to adjust my 
Sweave.sty with the option tabsize but that doesn't show an 
effect. Also the Sweave documentation did not provide a cue. 
Thanks for hints, *S*

-- 
Sascha Vieweg, saschaview at gmail.com