Recreate smoothing filter design

Hi,

I have two independet data sets. First data set = unfiltered data in blue. Second data set = filtered data in yellow.

What filter applied on the unfiltered blue data set would give me a very similar result to the yellow data.

I am basically trying to figure out what filter my hardware is using. I am especially interested in why the drop is curved and which filter would give me this curvy behaviour. I am unable to simulate this with a simple movmean.

[Mathieu NOE]

hello

if you use tfestimate on your both data sets , you should be able to get a Bode plot of your "filter". From there you can try fit a FIR or IIR model using invfreqs or invfreqz