Results of the micro-turbulence variation tests. We show for three stars, four different fits. These 4 fits are very similar except for the photospheric micro turbulence, which is changed from a fixed 10 km/s we used in the paper (blue), to 5 km/s (red), to 20 km/s (purple), and left as a fit parameter (green). We plot the 1-σ uncertainty of 5 parameters besides the v_mic. These are: effective temperature, mass loss rate, and the CNO abundance. The three different stars each get a column in the 6 different panels and the 4 different fits are slightly overlapping in this column.