The Stampa display. Left – The Stampa configuration menu. After running Stampa, a table is displayed, showing for every number of tag SNPs, the prediction accuracy of the best set of tag SNPs of that size. The user can choose the number of tags to display according to the required prediction accuracy. Right – The Stampa results menu. The selected tag SNPs are marked. The user can add or remove tag SNPs manually and recalculate the prediction accuracy of the new set.