Matched Stage 2: (19% [15% to 23%] of plumes, 20% [13% to 26%] of O&G emissions). Substantially more plumes were matched during the Stage 2 unblinded matching. Partners were sent a formatted document, including information about all production plumes unmatched in Stage 1, and GIS les for plumes and the context camera image. Partners responded back to the study team with possible operational explanations for 39 of the 51 plumes, summarized in Table , including both maintenance operations and other known emission events. Analysis of each response is listed in SI Section S-9.