Next we define time intervals over which to perform localization and quantification. We do so by taking the minute-by-minute maximum across the background-corrected concentration time series from each sensor, which collapses the signal from each sensor into one time series that captures the concentration spikes across the entire site. If the sensors sufficiently surround the site, then any on-site emission will cause an enhancement in this maximum value time series, regardless of wind direction. Since all non-spike observations have already been set to zero during background removal, we define groups of non-zero values in this maximum value time series as emission events. As a last step, we combine events that are separated by less than 30 minutes, as there are often small gaps between concentration enhancements that do not correspond to gaps in emissions, but rather to periods in which the methane plume is being blown between sensors.