Fig. 3From: Metabolomics analysis reveals the metabolite profiles of Rheum tanguticum grown under different altitudinal gradientsComparison of differences in the active constituents of R. tanguticum at different experimental sites (LD: Ledu; MH: Minhe; DT: Datong; HZ: Huzhu; GL: Guoluo). Significant differences at P < 0.05 are indicated by different lettersBack to article page