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Figure 2: Frequency distribution polygon showing the distribution and frequency of various components of aberration profile in group 1 (Arab origin) and group 2 (South Asian origin). (a) For total higherorder aberration root mean square, (b) for Coma, (c) for Trefoil, and (d) for Spherical aberration. The root mean square magnitude scale is similar for the four graphs in order to demonstrate their mean spreads with respect to each other 
