This was done by splitting the author team into blinded and non-blinded groups. The blinded group ran the PDM on the CMS concentration data before accessing the controlled release truth data provided by METEC. The non-blinded group only shared the truth data with the blinded group after the PDM results were finalized, at which point we removed all duration estimates associated with multi-source releases. The PDM as currently implemented assumes a single source is emitting at a time, and so we only evaluate it during these scenarios. This experiment had 79 single-source controlled releases ranging from 0.1 to 7.1 kg/hr in size and 0.5 to 9.0 hrs in length. Methane concentration data for this evaluation came from 10 CMS sensors placed around the METEC facility. Section S6 in the SI contains a full description of this experiment.