The maps (left) and profiles (right) of the specific star formation rate (top) and gas metallicity (bottom) with corresponding uncertainties. The radial profiles are obtained from the isophotal ellipses using the IRAF/ELLIPSE task (Jedrzejewski 1987). The vertical lines distinguish the region of the star-forming ring. The error bars for log SFR and log SFR are shown but their sizes are smaller than the symbol size.