Mapping of labels to composition spaces and plate ID. The compositional complexity of the best 21 catalysts in each dataset is noted by number of these catalysts with 1, 2, 3 and 4 cation elements in their compositions.

Plate ID	Label	Composition system	Num. of top 1% with N cations
			N = 1	N = 2	N = 3	N = 4
3496	A	Mn–Fe–Co–Ni–La–Ce	0	0	8	13
3851	B	Mn–Fe–Co–Ni–Cu–Ta	0	3	13	5
3860	C	Mn–Fe–Co–Cu–Sn–Ta	0	1	6	14
4098	D	Ca–Mn–Co–Ni–Sn–Sb	0	0	2	19