Fig. 6
Metallicity gradient in dex kpc−1 as a function of stellar mass. The grey line indicates the average gradient by Sánchez et al. (2014) and the grey shaded area the 1 σ scatter. Stars indicate the metallicity gradient measured in H IX galaxies, and the circles the gradients of the control galaxies (IC 4857 and GASS). All symbols are colour-coded by the H I mass fraction of the galaxy. Overall, H IX and control galaxies behave similarly to the galaxies in the Sánchez et al. (2014) sample.
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