Constant COARSE_GENERAL_TOLERANCE_M 

pub const COARSE_GENERAL_TOLERANCE_M: [(f64, f64); 8];

ISO 2768-1:1989, table 1, tolerance class c (coarse): the permissible deviation of a linear dimension with no tolerance of its own. Each entry is (upper size, ± deviation), m, for sizes above the previous entry’s and up to and including this one’s; the first band starts at 0.5 mm, included, below which the standard sets none. The standard is for machined parts; hpr borrows its coarse class for hobby airframe parts, which no standard covers.