Figure 3

Scatterplots of monthly GPPvpm and GPPmod17 versus SIF in the world’s top ten megacities during 2007–2014. Orange dots and fit-lines represent the relationship between SIF and GPPvpm. Blue dots and fit-lines represent the relationship between SIF and GPPmod17. The results of each analysis are statistically significant (n = 96, p < 0.001).