I somehow missed the response posted by Ben Bolker. He is quite correct
(happily for me!):
\SweaveOpts{keep.source=TRUE}
in your LaTeX code will (I think) keep whatever manual formatting you do,
in all code chunks (or use keep.source=TRUE) for particular code chunks
of concern
This information has made its way into the latest Sweave manual at
http://www.statistik.lmu.de/~leisch/Sweave/.
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