Before revision:  Moreover, constant scale ratios between successive modules arise through geometric relationships between triangular grids , whose lattice constants are separated by \sqrt{3 \approx 1.7, \sqrt{7}/2 \approx 1.3, or other ratios}  .
After revision:  Moreover, constant scale ratios between successive modules arise through geometric relationships between triangular grids \approx 1.7, \sqrt{7}/2 \approx 1.3, or other ratios} .