Figure 6. Results of regressions of band-depths normalized to band area with leaf chemistry using all data sets. Regressions for nitrogen, lignin and cellulose are shown in Figures 6a, 6b, and 6c, respectively. The data from different sites are represented by the various symbols: circle = Blackhawk Island, filled circle = Harvard Forest, triangle = LTER, asterisk = Rice, cross = slash pine, x = Howland, Maine, diamond = Douglas-fir (nitrogen only). Regression equations are given in Table 6.