Where is the code for radiometric calibration in SNAP?

Can anyone point me to the relevant files/functions for radiometric calibration.

For example in the GUI program, when I navigate to Radar → Radiometric → Calibration

I’m trying to mimic the code in Java to perform radiometric calibration for my own application. To that effect, does anyone know of any Python implementation of Sentinel-1 Radiometric Calibration for SLC/GRD imagery?

you can find it in the calibration module s1tbx/s1tbx-op-calibration at master · senbox-org/s1tbx · GitHub

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