Table 3 Linear correlations (Spearman’s coefficients) computed for the well-watered (WW; below the diagonal line) and the water-stressed (WS; above the diagonal line) treatments on week 6 of the experiment between the six variables: net CO₂ assimilation (A, μmol CO₂ m⁻² s⁻¹), stomatal conductance to water vapor (gs, mmol H₂O m⁻² s⁻¹), intrinsic water-use efficiency (Wi = A/gs), diameter at 5 cm (diam, cm), length of terminal shoot (shoot, cm), and total height (height, cm) with 32 trees in each treatment

From: Plastic response of four maritime pine (Pinus pinaster Aiton) families to controlled soil water deficit