Diagram showing the difference in an observed CTTS (teal) Li I 6707 Å line and that of a WTTS (orange). The deepest absorption feature (dashed light blue) represents a spectrum with no veiling and the same abundance of Li I 6707 Å as the CTTS. The hatched region represents the difference in absorption depth between the CTTS and WTTS. The shaded region represents the difference in absorption depth between the CTTS and the unveiled CTTS spectrum.