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Fig. 13.

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Comparison of the line profiles in the spectral stack including all star-forming galaxies selected in this work (AGNs excluded). The central wavelengths resulting from a Gaussian fit are highlighted in cyan, blue, red, and dark red for the Si IIλ1526 line (representative of low-ionisation lines), Fe IIλ1608, Al IIIλλ1854-1862, and Si IVλλ1393-1402, respectively.

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