Optical spectra of USco16m25 (black) obtained with Subaru/FOCAS at a resolution of 1000. The spectra were obtained on 19 June 2015 between UT = 07h and UT = 08h24m. Overplotted in red on the bottom spectrum is the GTC/OSIRIS spectrum obtained on 2 August 2015 at a similar resolution (see left-hand side panel of Fig. 5). The red dotted vertical lines mark the positions of Hβ and Hα lines at 4861 Å and 6563 Å, respectively.