Error beam contribution analysis for individual pointings. We performed the deconvolution using the exact approach via Fourier deconvolution. After deconvolution, we performed a baseline correction. In the panels, we show the observed line brightness (T_mb) as well as the contribution from the error beam, . For each panel, we indicate the contribution from the error beam to the emission with S/N > 3 (see masked region). The position of the pointings is indicated in Figure A.2.