Visualisation of the change of contour performed in Theorem 3.14’s proof. For better visualisation, we only show the change locally about $h1−$⁠. After the residue is ‘picked up’ in Step 2, we can safely let $α2→α2⋆∈h1−$ in Step 3 since the singularities of the integrand now lie completely on the contour $P′$ and the additional residue term poses no problems