Fig. 3. Bromide breakthrough curves (BrBTC) (top panel) and Cryptosporidium BTC (CpBTC) (bottom panel) in surface runoff (first row of each of the two panels) and in subsurface outflow (second row of each of the two panels). Left: Mean, minimum, maximum, and 95% confidence interval of the mean concentration for experiments with BrBTC = 0 (bromide BTCs) or CpBTC = 0. Right: As on the left side, but for BrBTC = 1 and CpBTC = 1, respectively.