(B-V) = 1.574 (b-y) + 0.696 m1 - 0.118 +0.010 E(B-V)
(U-B) = 0.675 (u-b) - 0.938
Cousins A.W.J.
(B-V) = 1.662 (b-y) + 0.860 m1 - 0.134 - 0.027 E(B-V) ; for (B-V) < 0.05
(B-V) = 1.520 (b-y) + 0.604 m1 - 0.092 - 0.015 E(B-V) ; for 0.05 < (B-V) < 0.70