Comparison of the mode-separated average profile shapes for observations at 112 MHz. (a) Mode-separated average profiles for session 221219, where the B-to-Q transition occurred in the middle of the observation. Violet and green lines correspond to the B and Q modes, respectively, and the thin blue line shows the composite B + Q profile. (b)B + Q profile (blue line) superposed on the average Tb-mode pulse profile (red line) shifted by 5.7 ms toward earlier spin longitudes. (c)B-mode pulse shape evolution starting from its onset (session 260520, dotted line) up to cessation (session 221219, violet line), together with Tb-mode pulse (red line) shifted by 5.7 ms toward earlier spin longitudes. (d) Tq-mode profile (blue line) accumulated from sessions 150518 and 051112. The B-mode profile in 260520 is given for comparison. Profiles for different days were aligned by the leading peak of the B-mode profile.