1. at% and wt% are abbreviations for respectively atomic percent and weight percent. Atomic percent is the percentage of one kind of atom relative to the total number of the mixture of atoms. Weight percent is the percentage of the mass of one kind of atom relative to the total mass of the mixture of atoms.
2. Since the axes were dispersed among the finder’s family and friends, the exact number of objects found is unclear. Possibly, the axes were tied together with a piece of rope (Fontijn 2003, 161).