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, Figure 1. Aerial photograph of the studied sector of the Cèze River (modified from Géoportail, IGN)

, With distances from upstream to downstream (kilometric points, triangles), location of the 17 hyporheic sampling stations (with gravel bar number, yellow arrows), the 8 karstic springs (beige arrows) and the 2 loosing sectors

, Chemical characteristics of the hyporheic water in the 17 sampled gravel bars (50cm deep 783 inside sediment). Correlation circle of the PCA (a) and location of the sampling station on the PC1 axis 784 (b; dots are the 3 replicate samples). Chemical variables expressed as the mean difference (D.) 785 between surface water and groundwater for electric conductivity (c)