Figure 8. Non-unique relationships between transpiration and CO₂ assimilation rates and maximal leaf partial evaporative area.

Computed relationships between maximal leaf partial evaporative area (a_max⋅d) and transpiration rate, E, according to Eq. (10) (solid line), and between (a_max⋅d) and CO₂ assimilation rate, A, according to Eq. (12) (dashed line) for the parabolic (s⋅d)-CO₂ function (Eq. S1). Arrows depict chronology (dashed arrows represent early Phanerozoic; solid arrows represent late Phanerozoic).