Panel a: difference between the broken and linear relation Δ(O/H)BLR,PLR/σOH,BLR (indicator of the strength of break in the O/H distribution) as a function of σSB,BED/σSB,PED (indicator of the strength of the break of the surface brightness profile). Panelb: difference between abundance gradients on different sides of the break in the abundance distribution as a function of the ratio of the disc scale lengths on different sides of the break in the surface brightness profile. Panelc: break radius of the radial oxygen abundance gradient Rb,OH vs. the break radius of the surface brightness profile Rb,SB. Galaxies with a Δ(O/H)BLR,PLR/σOH,BLR ratio larger than 1 (with a clear break in the radial abundance gradient) are plotted with circles. Galaxies with a σSB,BED/σSB,PED ratio less than 0.6 (with a prominent break in the surface brightness profile) are indicated by plus signs. The break radii are normalized to the isophotal radii R25 of the galaxies.
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