Top: Difference between the exact cross section of C₂H₂ (in green) and used in DALI (red, corresponding to the computational efficiency format in the Leiden Database). The light red curve shows only the continuum part of the cross section in the computational efficiency format. Bottom: Improvement of the UV shielding with the new implementation. The green line shows the exact photodissociation rate (computed with the exact cross section). The continuum (dashed red line) and lines (dash-dotted line) correspond, respectively, to the contribution of the dissociation in the continuum (i.e light red curve in the top panel) and in the lines.