Fig. 4: Correlations of alpha-pinene enantiomers resulting from edge effect around the 320 m ATTO tower and forest type.

Correlations between (+)-alpha-pinene and (−)-alpha-pinene sampled from different locations and heights. a At 40, 80, and 320 m during October 2017 (dry season) and at 80 m during March 2018 (wet season). Data obtained at 40 m and 80 m from 2017 has been divided by 10 to bring it onto the same scale as the rest of the data for clarity. Source: Zannoni et al. 2020¹⁴. The blue shaded bar indicates the low stress zone defined using the 95% prediction band from the data in Fig. 3a. b Drone measurements from 3 different locations, upland forest, white-sand forest, and ancient river terrace forest, from 8th–17th October 2024 taken between 12:00–13:30 local time.