(a) Extinction-corrected rest-frame Xshooter spectrum of J0232+0025 (grey line) overlaid with modelled SEDs. Nebular, stellar, and total (nebular+stellar) SEDs are represented by blue, red, and black lines, respectively. (b) Observed rest-frame SDSS (black line) and Xshooter (grey line) spectra of J0232+0025 overlaid with their corresponding attenuated modelled SEDs (the SDSS spectrum shown in red and the Xshooter spectrum shown in blue). (c) Observed rest-frame COS, STIS, and Xshooter spectra of J0232+0025 (grey lines) overlaid with modelled SEDs attenuated by adopting either R(V) = 3.1 (black line) and R(V) = 2.7 (red line), assuming the Cardelli et al. (1989) reddening law. Blue-filled circles denote GALEX FUV and NUV, and SDSS u, g, r, i, z photometric data. The red cross indicates the NUV flux calculated from the SED by adding the Lyα emission with an EW(Lyα) = 108 Å from the STIS spectrum. Dotted black lines indicate GALEX FUV and NUV response curves reduced to the J0232+0025 rest-frame. (d) Observed COS spectrum of J0232+0025 (grey line) overlaid with the intrinsic modelled SED (dash-dotted blue line) and the SED attenuated with R(V) = 2.7. The short horizontal red line represents the level of the LyC stellar continuum, and the vertical dotted line indicates the location of the LyC limit at 912 Å.