Figure 4-1: Dotplot matrix calculated for the genome sequences of the S. thermophilus phages Sfi19, Sfi11, Sfi21, O1205, DT1, 7201. The left x-axis provides a scale in kb. The phage sequence on the x-axis is identified below the column, that on the y-axis to the left of the row. The dot-matrix was calculated using Dotter (Sonnhammer, E.L.L. and Durbin R. (1995) Gene 167:GC1-10). The comparison window was 50 bp, and the stringency was 30 bp.