Difference between simulated and observed density maps (unitless) for the optimal p value for each species, (a) pike (p = 10%), (b) perch (p = 20%) and (c) pikeperch (p = 61%). Positive values indicate larger density values for simulation than for observation. Negative values indicate smaller density values for simulation than for observation. Values smaller than −4 and larger than 4 are truncated to −4 and 4 on the map. Grey color indicates blind areas where no fish could be tracked by the telemetry system. Upstream part is to the North-East and downstream part to the South-West.