using subtr_baseline()

[phoebe-sch]

Hi -
I am trying to subtract a background spectra from my sample spectra. The following code does work but it sends a large portion of my sample spectra into the negatives.

sample_newbaseline <- subtr_baseline(sample, type = "manual", baseline = background)

My aim is to be able to "fine-tune" how I remove the background spectra. For example:
sample_newbaseline <- subtr_baseline(sample, type = "manual", baseline = background$spectra*0.75) or something like that

Or is there a better function within openspecy to allow me to do this?

Thanks!