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Figure 3: Smoothed PSA over time grouped by Zn addition treatment in barley (a), tomato (b), and Medicago (c) plants inoculated with the AMF R. irregularis (blue) or mock-inoculated (red) and grown at four (a, b) or six (c) different soil Zn concentrations ranging from no addition of Zn (Zn 0) to high soil Zn addition. On each panel, the darker lines represent the loess mean PSA of replicates within a treatment, while lighter lines correspond to individual replicates.