(a) Nitric oxide emission (ppm) variations with and fueling composition. (b) Nitrogen dioxide emission (ppm) variations with and fueling composition. (c) NO_x emission variations (ppm) with and fueling composition. . FAR: fuel : air ratio [1]. . FAR: fuel : air ratio (herein, arp). . FAR: fuel : air ratio (herein, arpc). Aerospace-recommended practice (arp) and (arpc) corrected arp. . : mass flow rate of (g/s), : mass flow rate of fuel (kg/s), : molar mass of , : moles of , and FAR: fuel : air ratio . (g/kg) [EINO_x] SAE ARP . [NO_x] [CO] [CO₂] [C_xH_y] = mass fractions of NO_x, CO, CO₂, and total hydrocarbon THC, : molar mass, : ratio of : in fuel where NO_x mol mass is assumed to be 46, contrast to Figures 11(a) and 11(b).