a, 4b and 4c demonstrate the modelled main concentration plume from the suspected cooling tower during the short time three of the four stray visitors visited Lidköping during the
outbreak 2004. The fourth stray visitor spent two hours within 50 meters from the cooling tower. Bright red color stands for the highest concentration. Figure 4a, Stray visitor 1 August 04. Figure 4b, Stray visitor 2 August 05. Figure 4c, Stray visitor 3 August 09.