Fig. 4. PPF absorption and corresponding carbon gain by V. sanguinolenta plants of different sizes in two light environments as calculated by Y‐plant. Closed symbols indicate simulated, normal plants; open symbols indicate plants modified to exhibit a divergence angle of 137·5° between successive leaves. Regression lines are y = 82 (1–e^–0·009x) (r² = 0·94) and y = 73·9 e^{(–0·5 (ln (x/428)/1·552)} (r² = 0·92).