curve fitting of a fluctuating curve

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Annemarie
Annemarie 2019-11-19
I observe a mass flow balance which should converge to a value of zero for a steady state (picture, real values are green, already fitted curve is read).
Currently it fluctuates around zero so I want to assume when a steady state ist reached. Which function can I use for this? I have already used the extrapol-function but its not considering the fluctuations which will become lower.
Thank you in advance!
Annemarie

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