Shrinkage along the rays — the wide dimension of a quartersawn board. Roughly half the tangential value, making quartersawn the most stable cut.
Quartersawn moves half as much as flatsawn — radial shrinkage is the reason.
A cut where annual rings run perpendicular to the face. Shows straight grain and, in oak, dramatic ray fleck. Most stable; expensive yield.
Shrinkage across the annual rings — the wide dimension of a flatsawn board. Always greater than radial shrinkage; usually about twice as much.