The reactivities toward O2 and N2O are best compared by comparing EEO2 to EEN2O, which include the effect of differences in NP size, oxidant pressure and sublimation rates. of magnitude at 1900 K The fact that O2 attack can potentially etch twice as many carbon atoms, obviously cannot account for such large EO2/EEN2O ratios, but there are several other factors that may have larger effects.