[R] Best way to select good points in a noisy signal ?

[Ptit_Bleu]

Hello, 

When I plot y=f(x) from the file xy.txt (
http://www.nabble.com/file/p18773387/xy.txt xy.txt ), I can clearly see a
trend.
Is there a function or a package able to take the median value of y for an
interval of x (x +/-  a defined value) to plot nice graph (at least a better
one) ?

Thanks in advance,
Have a nice week-end,
Ptit Bleu.

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