Fig. 1From: Prediction of fecal indicator organism concentrations in rivers: the shifting role of environmental factors under varying flow conditionsFIO concentrations in relation to discharge and global solar irradiance in river Rhine (a) and Moselle (b) throughout sampling campaigns 1 (2010/11) and 2 (2016/17). The blue and red dotted lines indicate 900 MPN/100 mL and 330 CFU/100 mL, respectively, corresponding to the percentile threshold for a sufficient water quality in the EBWDBack to article page