(M_V,V−I_C) diagram for the MCC stars (black solid and red circles) and stars from the CNS list (black open and blue circles). The thick line is the mean relation for the color interval 0.9 <V−I_C< 2.8, defined by Bartašiūtė et al. (2012) using the present sample stars with σ_π/π ≤ 0.05 (red and blue circles). The error bars represent uncertainties due to trigonometric parallax error. Spectral types shown on the top axis are in accordance with the calibration of V−I_C by Bessell & Brett (1988).