Various sources provide dierent estimates of the detection sensitivity for the Carbonmapper method, ranging from a popularly quoted `10-20 kg/h' to 32 kg/h in a 3 m/s wind by Conrad et al. to a `full detection limit' of 280 kg/h by Kunkel et al. . In this study, the mean estimated plume emission rate was 283 kg/h, with 95% of all estimates above 30 kg/h.