GC differences between neighboring isochores. The distribution of GC differences between adjacent isochores is shown for each method. The thick bars within each box plot indicate the median. The IsoFinder and GC-Profile assignments have the largest GC deltas, on average, whereas in the BASIO isochore map the GC deltas are lowest (median 3.5, mean 4.0). Outliers are not shown in this plot. The average delta GC in the consensus map is 4.6, the median 4.1.