Surface brightness profile of emission around the Geminga pulsar measured with HAWC (Abeysekara et al. 2017a). Shaded regions indicate the parts of the emission profile that are used as ON (radius θ ≲ 1.0°) and OFF normalisation (radius θ ≳ 3.2°) regions to estimate the background level and evaluate the significance in the analysis of the 2019 H.E.S.S. dataset. The region shown for normalisation of the OFF counts is only accessible with the 2019 dataset, due to the wider pointing strategy used.