Representative Hα profiles from RCW 48 are shown all around the displayed Hα image. The Hα profiles are extracted from the areas delineated on the image. The axes are the V_LSR in km s⁻¹ (X axis) and intensity in arbitrary units (Y axis). The profiles are decomposed into one to three components (labeled “0” to “2”) and night sky lines (labeled “N”), when necessary. The solid and dash dotted lines are the observed and the fitted profiles, respectively. All profiles, except (7) and (8), were observed with the P  =  796 interferometer.