While most MII eorts would deploy only one TD method, this study had access to two TD technologies to support additional analysis. The methods selected for the study both create facility estimates, but use distinctly dierent measurement instruments and analysis algorithms. Since both were deployed contemporaneously (same day in most cases), these estimates can be compared to better inform the uncertainty of both methods. with Solution 1 reporting emissions that were statistically lower than Solution 2 in 20 comparisons and higher in 6 comparisons. Results are compared using other methods in the SI Section S-3.2.