Chlorophyll /m gl^-1(top), and difference between catalysed and uncatalysed transfer velocity (bottom), for chlorophyll-only enzyme distⁿ with average concⁿ 3.3nM / 10^-2 mol m^-2 m atm^-1 yr^-1, both as a function of D pCO₂ (m atm) and temperature (^oC).