Table 1: rms errors of the magnitude differences (instrumental system) between the comparison stars in units of 0.1 mmag. N is the total number of magnitude differences.
Objects N y b v u
DWCar          
HD 93191, HD 92072 (C1,C2) 141 50 47 44 62
HD 93191, HD 92288 (C1,C3) 279 59 56 56 79
HD 92072, HD 92288 (C2,C3) 115 69 58 63 88
BFCen          
HD 100942, HD 101466 (C1,C2) 989 40 37 35 53
ACVel          
HD 93943, HD 92757 (C1,C2) 1678 37 35 58 66
NSV5783          
HD 108925, HD 109808 (C1,C2) 413 49 41 43 59

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