Peak-to-peak velocity of the double-peaked emission lines in the spectra of B243, B268, and B275 is shown on the x-axis, and the date of observation is plotted on the y-axis. The peaks are measured after subtracting the stellar feature by a double-Gaussian fit. The velocities in B243 (left figure) range between 130 km s⁻¹ and 180 km s⁻¹, and there is a general trend in velocity over the five epochs, which is most apparent for all lines in the last three epochs. In B268 (middle panel), the velocities range between 220km s⁻¹ and 300 km s⁻¹, and the velocity difference is 65 km s⁻¹ between the Ca II triplet and Mg I peak-to-peak velocities (the legend of B275 can also be used to read the middle panel). The velocities in B275 (right panel) range from 70 km s⁻¹ to 165 km s⁻¹.