Fig. D.1

NGC 4501. Upper left panel: molecular fraction as a function of stellar surface density. Upper right panel: molecular fraction as a function of the total gas surface density. Lower left panel: total gas as a function of molecular fraction divided by ISM pressure. Lower right panel: pressure due to the gravitational potential of the gas divided by the pressure due to the potential of the stellar disk (Pg/Ps) as a function of the molecular fraction divided by ISM pressure. For clarity we only show a few errors bars.
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