How to get CDOM (Coloured Dissolved Organic Material) and DOC (Dissolved Organic Carbon)

Hello; Does anyone knows how to get B3/B4 ratio in SNAP (as a graph or other…) to be able to get CDOM (Coloured Dissolved Organic Material) and DOC (Dissolved Organic Carbon) levels.

You can use the Band Maths. There is a video tutorial for it:
SNAP - Band Math - YouTube

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Thank you so much Marco