Fig. 1From: Microbial colonization and persistence in deep fractured shales is guided by metabolic exchanges and viral predationSampling design for input and produced fluid samples with metagenomic sequencing from the STACK shale play. Input samples obtained during the development of the well (A) are color coded to match the produced fluid timeseries for each well (B) in which they are associated with. Drill muds were collected from a nearby, drilling operation and are thus not colored to match the three STACK wellsBack to article page