Evolution of the spectra during the late post-outburst phase of T Pyx from 2014 Mar. 13 to 2017 Nov. 23. As the system evolves, the lines develop into narrow emission ones from broader profiles. The [O III] lines are blue-shifted by ∼780 km s⁻¹ beyond day 1721 and the [N II] 6874 Å line can clearly be seen in this phase. The identified lines and time since discovery in days (numbers to the right) are marked.