Results of the cluster analysis, which are plotted the vote maps, are shared in two text files, named clustervotes Vs CottaarLekic2016.txt and clustervotesVp CottaarLekic2016.txt. The format of these files is: longitude (deg), latitude (deg), depth (km), # votes for slow, # votes for neutral, # votes for fast, color index. The depths correspond to the centre of a 300 km wide depth window. The last column corresponds to the colormap in Figure 1 and the corresponding colorscales are provided in text format (colortriangle CottaarLekic2016.txt).