In this study, Solution 1 typically screened (hereafter termed an `overight') each facility twice during one day, typically making multiple passes to complete each overight. Each facility overight takes less than an hour, while individual plumes are scanned in a few seconds. Since each overight has multiple passes, an individual emitter may be characterized by several plumes. If the emitter appears in more than one pass, the emissions from that source are averaged and included only once. Therefore, the estimated facility emissions for Solution 1 are the result of adding estimates from multiple distinct plumes into one overight estimate. In this study, each overight, typically separated by several hours, is treated as an independent estimate. Solution 2 uses a ux plane method with concentration data from a miniature, tunablelaser spectroscopy sensor on a drone platform. The ux plane methodology is thoroughly discussed in literature. Briey, the drone-mounted sensor measures methane concentration while making multiple downwind passes through the facility's emission plume at dierent heights, typically from near ground level to above and outside the plume i.e., above any methane enhancements from the equipment being measured. Concentration measurements, multiplied by the normal of the wind speed through the plane of ight, are integrated across the ight plane to calculate an emission rate.