Calculate the ratio factor and miller indices from this table and hence determine the unit cell dimension.

20 20 Sin e Sin 0 Ratio Ratio H K factor 12.5 6.248 0.10 0.01 1 20.3 10.133 0.18 0.03 3 23.7 11.865 0.20 0.04 4 17.6 15.580 0.30 0.07 7 31.2 18.568 0.32 0.10 10 37.1 20.219 0.35 0.11 11 40.4 21.148 0.36 0.13 13 42.3 22.632 0.38 0.14 14 45.3 23.462 0.40 0.15 15 53.6 26.818 0.50 0.20 20