// define STORE_MOLE_FRACTIONS if you want Cantera to internally
// represent the composition of a mixture as mole fractions. Usually
// the best choice.
#define STORE_MOLE_FRACTIONS

// define STORE_MASS_FRACTIONS if you want Cantera to internally
// represent the composition of a mixture as mass fractions. Usually
// results in slightly worse performance, but may not in all cases.
//#define STORE_MASS_FRACTIONS
#undef STORE_MASS_FRACTIONS