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We test this assumption using the DESI DR1 Emission Line Catalog. For star-forming galaxies with fiducial emission lines, [O II] yields systematically higher electron densities than [S II], with a median offset of 0.228 dex. The binned median calibration is $\\log n_e({\\rm OII})=(0.752^{+0.182}_{-0.097})\\log n_e({\\rm SII}) +(0.832^{+0.231}_{-0.422})$. 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