Average flux in the interferometric channel (triangles) and in photometric channels (dots = beam1, diamonds = beam2, and crosses = beam3) versus the magnitude m_R. The mean level of the detector noise in a photometric channel (purple dashed line) and the photon-magnitude relation (red dash-dotted line), with the adjustment of the constant term in the exponent (F = 10^{−0.4m_R + 4.37}), are also displayed.