Same as Figure 1, but showing the individual Hα spectra of SR 12 c. Panels (a)–(e) correspond to observing sequences #1 to #5, respectively. The red lines represent the results of Gaussian fitting to the spectral wings at −200 km s⁻¹ <v < −20 km s⁻¹ and +80 km s⁻¹ <v < +200 km s⁻¹. The gray regions at −20 km s⁻¹ <v < +80 km s⁻¹ were excluded from the Gaussian fitting. The fitting was performed using gnuplot (http://www.gnuplot.info). Unidentified systematic effects may be present at approximately −175 and +175 km s⁻¹ (see Section 2).