Overview of the likelihood-ratio test analysis used in IC18. The left column shows a reconstructed neutrino direction and its angular uncertainty on the sky with a cross and grey contours, respectively. Nearby source directions are shown by the blue circles, with darker and larger markers representing their contribution to the 𝒮 term in Eq. (2). The centre column shows a 1D projection with the bars representing the flux weights, w_i, model for each source. The right panel shows the inverse cumulative test statistic distribution in grey, with the test statistics calculated in each case indicated by the arrows. The weights of nearby sources strongly influence the test statistic value and that different scenarios can lead to significant results.