Comparison stars, S1 and S2, for EG And 
 used in the files: "eg_s1.dat", eg_s2.dat"

 S1: HD 4143 
 S2: HD 3914

Measured magnitude differences DU, DB, DV in U, B, V filters:

 DU(S1-S2) = 4.640 +/- 0.015
 DB(S1-S2) = 2.722 +/- 0.017
 DV(S1-S2) = 1.563 +/- 0.006

Ref.: Hric, L., Skopal, A., Urban, Z., et al. 
         1991, CoSka, 21, 303-331