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Maps of the correlation coefficient C for the DIC-SA (a) and DIC-LA (b) systems. Values closer to 1 indicate an accurate correlation. For DIC-SA, one virtual camera was at 45 deg (3_1) and other at 43 deg (3_2). For DIC-LA, one virtual camera was at 45 deg (3_1) and other at 31 deg (3_6).