These plots show three of the best bacterial tracking paths of the algae P. lutheri, each track represents the path of individual cells. a,b: Plots of a P. lutheri algal cell tracked by P. haloplanktis bacteria. c: Plot of a P. lutheri algal cell tracked by a S. putrefaciens bacterium. There are no error bars for these plots of algae tracked by bacteria because they are direct tracks of algal and bacterial cell paths. The x,y coordinates are in micrometres. Tracks of the algal cells always start in the bottom left hand corner of each figure, bacterial tracks generally start to the left of the plot but not at the same x,y coordinates as the algal track.