Residuals for the thin and the thick discs scale-heights with respect to the linear regression (top and bottom panels, respectively) as a function of the fraction of baryons in the form of gas. The residuals are calculated with respect to the linear regression made for all galaxies, that is without excluding gas-poor galaxies (grey dotted line in Fig. 17). Filled black dots correspond to gas-rich galaxies, and grey circles correspond to gas-poor galaxies.
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