Photometric profiles in the U (blue), B (green), NUV (black) bands, and Hα line (red) along the ring (thin curves) and the spiral arms (thick curves). The ordinate units are magnitudes and logarithm of Hα flux in units of erg s⁻¹ cm⁻² within the aperture. Positions of local maxima of brightness on the profiles in the U, NUV bands, and Hα line are indicated by circles for the ring (large symbols) and for the arms (small symbols).