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Fig. 2. Transmission X-ray microscopy (TXM) images of setae in the beetle
Gastrophysa viridula (a) not in contact and (b) in a fresh contact
with a Si3N4 membrane surface. Please note changes in
the shape and optical density of spatula. The optical density scales with the
thickness of the material, if one assumes the same density of the material of
the spatula.