This section describes the process used in Figure , step (D). In Step (A) the analyst recreates the annual inventory data by building Site Information and Site Configuration for each facility in MAES. Simulations produce granular, time-varying, emission estimates for each site, which are converted into statistical rep-335 resentations of emissions: i.e. the probability that a survey method would see emissions of a specific size (Figures and). In Step (B) and (C) maintenance emissions were separated from aerial detections for later processing. Therefore, entering Step (D), the MAES results represent statistics of emissions expected from the reported inventory (Figure ), while aerial detections, with their uncertainty, represent statistics of abnormal failure conditions which may or may not be in the inventory. Both data sets are also at the same 340 time resolution.