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. 2016 Dec 1;16:212. doi: 10.1186/s12886-016-0391-1

Fig. 9.

Fig. 9

Double-angle plots of postoperative total corneal astigmatism. The mean vector of the astigmatism (represented by the grey rhombus larger than the other plots) was 0.38 D axis 4° (each ring = 0.5 D, outer ring = 3.0 D)