Fig. 7. Width difference vs. formation temperature. The "width difference" represents the difference between the line width observed on the meridian and that at other locations. Diamonds : large µ sector; Stars : small µ sector (i.e. widths of hole profiles relative to non-hole profiles). The solid line shows a second order polynomial fit to the small µ sector points, while the dot-dashed line shows a fit to the large µ sector points.