Additional file 1 of Supply ranges of stone blocks used in masonry bridges and their construction period along the East Royal Road in the Khmer Empire, Cambodia UchidaEtsuo SakuraiYuichiro ChengRathborith ShimodaIchita SaitoYu 2020 Additional file 1: Data used for the cluster and principal component analyses. The median concentrations of each element and magnetic susceptibility data listed in Table 1 were standardised to a constant total.