Different PPF for different wavelength?

Hi,
how can I use different PPF values for different wavelengths with mne.preprocessing.nirs.beer_lambert_law? I have calculated the appropriate PPF values accounting for the age of my subjects as well as the two wavelengths I use (760nm and 850nm) according to this paper: https://pubmed.ncbi.nlm.nih.gov/24121731/

Is it possible to use a different PPF values depending on the wavelength when calling mne.preprocessing.nirs.beer_lambert_law?

Thank you for your help!
Regards.

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