Distributions of the ratio FWZI/FWHM of the SiO(2–1) line for the sources with (red solid histogram) and without (blue dashed histogram) Lyman excess. The FWZI is measured at 25% of the line peak (see text). The vertical line denotes the value of the ratio expected for a Gaussian profile. The bin size has been chosen following the Freedman-Diaconis rule.
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