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L Red Maddox with 45º and vertical lines from center.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 211000
M Red Maddox with 45º lines and red filter.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 209000
N Red Maddox with 45º lines and occluder.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 207000