A(Li) vs. v sin i. Points are colour-coded according to the age (panels a, c, e) and T_eff (panels b, d, f) of the stars (see the colour bars on the right). Panels a and b: field stars without detected planets; panels c and d: field stars with detected planets. Cluster stars are represented in panels e and f. The diagram of panel e shows the age in a logarithmic colour scale ranging from dark blue for 0.035 Gyr to red for 5 Gyr.