Estimated molecular abundances with respect to H₂ for the three studied cuts, TMC 1-CP (black squares), TMC 1-NH3 (red) and TMC 1-C (blue) as a function of the visual extinction (left panel), dust temperature (center panel) and molecular hydrogen densities (right panel). The horizontal lines indicate a representative value in the translucent part (red dashed line) and a variation of a factor of 2 relative to it (black dashed lines). Vertical lines mark A_V = 3, 5, and 10 mag.