This figure shows the mutational spectrum of a sample of tumors from TCGA on a circular plot. By visualizing data in this way, researchers can see the natural groupings of tumors according to where they fall along a mutational spectrum. (Lawrence MS, Stojanov P, Polak P, et al. Mutational heterogeneity in cancer and the search for new cancer-associated genes. Nature. 2013;499(7457):214-218. doi:10.1038/nature12213.)