O- and B-type star DIB 6614  Å (top), DIB 4428  Å (bottom) equivalent widths (Å) vs. average extinction (A_V, mag) of nearby young stars and nearby RC stars. Average extinction of young stars within 1 and 5 are shown in black and green. Average extinction of RC stars within 5 and 15 are shown in grey and red. Greater number of stars in selection is depicted by larger points. Green and red points use smaller scale than black points and grey points.