On 7/10/2008, at 2:53 PM, Carlos Guâno Grohmann wrote:

Hello all. This is likely to be a silly question, but I have a set of
data points and I want to fit a curve to it, like this:
http://www.igc.usp.br/pessoais/guano/temp/curve.png.

which function should I use?

Have a look at smooth.spline() and loess().

        cheers,

                Rolf Turner
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