Example of the observed profiles and fits with a parabola. Black symbols indicate the observed profiles in Ca⁺H, Ca⁺IR, Hϵ, and Hγ normalized by the maximum intensity of each profile. The wavelength position of each peak (blue solid lines) is determined from fitting (red lines) with a parabola using interval at which the intensity is larger than 75% of the peak intensity. The inferred Doppler velocities of Ca⁺H, Ca⁺IR, Hϵ, and Hγ are 14.5 ± 0.2 km s^-1, 18.5 ± 1.7 km s^-1, 19.1 ± 0.5 km s^-1, and 16.2 ± 0.4 km s^-1, respectively. The measurement error is indicated in each title for the 1-sigma uncertainty, and in each plot as the blue dotted lines for the 3-sigma uncertainty. The minimum and maximum wavelength ranges displayed in the individual panels are −70 and + 70 km s^-1, respectively. The black vertical solid lines denote the wavelengths where the Doppler velocities are equal to zero.