Location of PS16dtm (full circles) on the AGN main-sequence plane, that is the FWHM Hβ line vs. R_FeII, where R_FeII is the ratio of the equivalent width of the FeII, measured in the 4434−4684 Å wavelength range to Hβ. The SDSS quasars from Shen et al. (2011) catalog (gray dots) as well as the NLSy1 from Rakshit et al. (2017) catalog (blue dots) are also shown. Solid lines at 4000 km s⁻¹ and R_FeII = 1 indicate separations between different populations of AGN (Marziani et al. 2018). The color-bar indicates the day after MJD 57577.