[R] Find a particular point on a curve

[Joanie]

The most important thing is the point termed "C" (on the image):
http://r.789695.n4.nabble.com/file/n3926631/courbe_temp%C3%A9rature.png 

which is the first point (time, temperature) where temperature stabilizes
after the temperature drop (end of feeding). The definition of that
particular point is :

The point where temperature stabilizes within 1 sd (calculated from the
prefeeding temperature) over a minimum of 10 minutes.

Can someone help me writing the code for it?

Thank you very much,

Joanie

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