Appendix 1—table 6. Summary of the number of EU clusters based on their presence in MAGs and their environmental distribution, obtained with the Levin’s Niche Breadth index.

	Total clusters	Broad	Narrow	Non-significant
Total EU	204,031	471	8421	195,079
EU in MAGs	55,520	88	316	55,116
EU not in MAGs	148,511 (73%)	383 (81%)	8105 (96%)	140,023 (72%)