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Fig. 4. Spectral radiance along different lines of sight at different depths in Australian reef and coastal waters. (A) Reef water 1 m depth; (B) coastal water 1 m depth; (C) reef water 5 m depth; (D) coastal water 3–5 m depth. Solid line, down-welling radiance; broken line, horizontal radiance; dotted line, up-welling radiance.