To determine the amount of sunlight that can be absorbed by a person floating on top of the water using the graph you've described, you would need to look at the graph where the depth (in meters) is at zero (the surface level) and see what percentage of sunlight remains at that depth.
Typically, the amount of sunlight decreases as the depth increases, so at a depth of 0 meters (the surface), the percentage of sunlight remaining is generally 100%.
Without viewing the specific graph you are referencing, I would provide the assumption based on common scenarios that a person floating at the water's surface would receive approximately 100% of the remaining sunlight.
If you have specific data points from your graph, please share them to get a more accurate result!
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