Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, UK. jacob.koehler@bbsrc.ac.uk|Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, UK. jacob.koehler@bbsrc.ac.uk|Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, UK. jacob.koehler@bbsrc.ac.uk|Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, UK. jacob.koehler@bbsrc.ac.uk|Biomathematics and Bioinformatics Division, Rothamsted Research, Harpenden, UK. jacob.koehler@bbsrc.ac.uk