Values of ν_conv that satisfy the minimum value for χ² for the 93 lines (plus symbols). The standard error represents the scatter from the mean of each line () and a and b are coefficients of the least squared fit, ν_conv = aλ + b. The Ca i and Fe i lines used by Aoki et al. (2004) to constrain macroturbulence have been plotted (triangles) to show the consistency of our χ² fits with their results at red wavelengths.