Oxygen abundances along the slit for the slit 8 in the NGC 3023. The circles in the upper panel show the oxygen abundances determined from the individual blue one-pixel-width spectra through the T_e method. The solid line is the abundance obtained from the integrated seven-pixel-width spectrum through the T_e method. The circles in the lower panel show the oxygen abundances determined from the individual red one-pixel-width spectra through the C_NS method. The solid line is the abundance obtained from the integrated seven-pixel-width spectrum through the C_NS method.