The current Finesse fitting is performed using an exponential function that takes offsets into account.
I prepared a GUI to analyze the current measured data using a function that does not take offsets into account.
This script (FinesseAnalysisGUI_develop.py) is located in the lsc/common/scripts directory of userapps.
Internally, it calls the previous fitting library, finesselib.py, and the current script uses finesselib_develop.py.
However, perhaps because the Yarm IR value was different from the previous measurement, the Yarm measurement results could not be fitted properly.
Therefore, I changed the initial value given to curve_fit from [1,0.004] to [100,0.004]. This allows both X and Y to be analyzed using the previous fitting function.