LBT/LUCI images for the S255IR star-forming region. Left panel: adaptive optics assisted K_s band image for the S255IR region displayed in linear scale. The FWHM at the position of the AO guide star is ~0″.06 (see Appendix A for more details). The black circles represent sources reported in Zinchenko et al. (2020), whereas the red squares represent Gaia sources used for astrometric solution. Right panel: RGB AO assisted image with red H₂, green Brγ, and blue K_s. The red box indicates the FoV shown in Fig. 2.