Figure 7-33: Comparison of all available in situ measured NOx emission index values with corresponding predicted values: (A) Schulte et al. (1997); (B) Schlager et al. (1997); (C) Schulte and Schlager (1996); (D) Fahey et al. (1995a); (E) Fahey et al. (1995b); and (F) Haschberger