Clarification on the function "compute_band_power_deviation_and_tilt" in GnPy 2.11

[mukherjeearup]

Hi,
I see the following method used to find SRS tilt target and relative power deviation at each band:

def compute_band_power_deviation_and_tilt(srs_power_deviation, design_bands: dict, ratio: float = 0.8):
"""Compute the power difference between bands (at center frequency) and the power tilt within each
band.

Args:
    srs_power_deviation: The list of dictionnary containing the power at band centers and the tilt within each band.
    ratio: the ratio applied to compute the band tilt
Returns:
    A tupple of dict containing the relative power deviation with respect to max value, per band in dB and the tilt
    target to apply for each band.
"""

I have couple of questions:

1. In the above method, Arg "srs_power_deviation" contains each band centre freq power and tilt within each band, but I did not understand, how is the other arg "ratio" derived with the default value of 0.8?
2. Because of SRS, the centre freq of each band will have different power. How is that compensated in the gain target of the next amplifier?

Regards,
Arup