Fig. 5.


Closeup of one of the rear grids (number 26) seen with front illumination is shown on the left. The slats run from lower right to upper left. The five faint orthogonal lines from the lower left to the upper right are “bridges” which add structural strength but do not degrade imaging. The image on the top right shows a closeup of the same grid, corresponding to the white box on the left. Bottom right: closeup of a much finer pitch grid (number 1).

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