Abundances of C I as a function of T_eff, derived from the optical analysis (empty symbols), from the NIR line (red symbols), and from CH band at 4300 Å. The different symbols are the different estimates for the same star: the diamond represents TYC 1991-1235-1, the star HIP 61205, the pentagon HD 167389, the circle HD 70573, the triangle HD 59747, the square TYC 1989-0049-1, and finally the x-shaped symbol indicates TYC 1989-147-1.