The study was assisted by 7 companies (`partner operators') with major operations in the DJ basin. For all but one partner, the study was double-blind: The operators did not know where the aircraft had detected plumes, and the aircraft team did not know where events had been reported. These partners also supported onsite measurements of emissions by the ground teams (not covered in this paper). The remaining operator was engaged in merger activities during the eld campaign, but provided event data approximately 6 months after the last eld period, prior to being informed of any aerial results (SI Section S-2).