# Skewing and unskewing factors for 2, 3, and 4 dimensions
use constant {
   F2 => 0.5 * (sqrt(3.0) - 1.0),
   F3 => 1.0 / 3.0,
   F4 => (sqrt(5.0) - 1.0) / 4.0,
   G2 => (3.0 - sqrt(3.0)) / 6.0,
   G3 => 1.0 / 6.0,
   G4 => (5.0 - sqrt(5.0)) / 20.0,
};