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In photoacoustic measurements with local illumination, two photoacoustic waves are generated simultaneously: one where an absorbing abnormality is, and a second one near the interface of the tissue. This local optically generated acoustic wave, propagating from the sub-surface throughout the medium, carries information of purely acoustic nature that can be introduced, if properly filtered, as prior knowledge or constraint in the photoacoustic reconstruction process, especially if the abnormality presents also an acoustic contrast (e.g. tumors).