K_fns                   List of all functions
calc_K                  Calculate a single equilibrium constant
calc_K0                 Calculate K0
calc_K1                 Calculate K1
calc_K2                 Calculate K2
calc_KB                 Calculate KB
calc_KF                 Calculate KF
calc_KP1                Calculate KP1
calc_KP2                Calculate KP2
calc_KP3                Calculate KP3
calc_KS                 Calculate KS
calc_KSi                Calculate KSi
calc_KW                 Calculate KW
calc_Ksp                Calculate Ksp
calc_fluorine           Calculate fluorine
calc_ionic_strength     Ionic strength after Dickson (1990a); see
                        Dickson et al. (2007)
calc_pc                 Calculate pressure correction factor for Ks
calc_pressure_correction
                        Calculate pressure correction factor
calc_seawater_correction
                        Kgen seawater composition correction function
calc_sulphate           Calculate sulphate
kgen_poly               Kgen R polynomial function
