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Fig. 3. Measurement of the thickness of a seta from the beetle Gastrophysa
viridula in contact with the substrate. (A) TXM image of the spatula
region of a seta, in contact with a Si3N4 membrane
surface. (B,C) Line scans taken at the positions 1–8, as marked in A. To
increase the signal to noise ratio, the scans have been averaged between the
two lines of each position.