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Montage maps of a Maxtaform H6 235 pitch finder grid (Pelco) before and after “flip-flop” specimen rotation at 990x nominal magnification. R.C. stands for rotation center. (a) Before rotation. The arrow points to the map center. (b) After rotation. The arrow points to the new location where the center of the pre-rotation map has been displaced. Both maps were constructed at the origin of stage xy plane.
