Additional file 6 : Figure S1. T-distributed stochastic neighbor embedding (t-SNE) plot of MYCN amplified cases showing the MYCN amplified ependymoma cluster (thick red arrow) and single outlier case 4 (thin red arrow) in the context of the complete reference set from the DKFZ. Note the extreme distance from the major group of classical spinal cord ependymomas identified with a red circle at bottom of the figure.