Change in [F/Fe] as a function of variation in ξ_micro. The color-coding indicates the T_eff (see color bar at right) for the first five HF lines (R19, R18, R16, R15, and R14; top) and the last five HF lines (R13, R12, R11, R9, and R7; bottom). The variation in [F/Fe] for a +0.2 km s⁻¹ change in ξ_micro is shown by inverted triangles and for a −0.2 km s⁻¹ change in ξ_micro by circles.