Face S1 & S2 polished flat to
within l/10 @632.8 nm over test region;
Face S3 & S4 parallel to each
other within 5 arc minutes;
Face S3 & S4 polished flat to
within l/2 per 1 inch over test region;
Face S1, S2, S3
& S4 surface finish 10/5 scratch/dig per MIL-0-13830A;
Face S5 & S6 are both fine
ground;
Protective chamfers to be applied to all edges unless otherwise
stated;
Parallelogram-shape slabs and polyhedrons
also available in GOT.