GIS shape files of realm maps
Datasets usually provide raw data for analysis. This raw data often comes in spreadsheet form, but can be any collection of data, on which analysis can be performed.
Costello MJ, Tsai P, Wong PS, Cheung A, Basher Z., Chaudhary C. 2017. Marine biogeographic realms and species endemicity. Nature Communications 8 (1057).