Two views of the interstellar medium in the surveyed field, with the main structures in the region marked. The top panel presents the view in the MSX band A (6.8–10.8 μm), while the bottom one presents the Canadian Galactic plane survey (CGPS; Taylor et al. 2003) radio continuum emission at 21 cm. The symbols mark the stars photometrically selected in the current work after removal of those whose spectra do not confirm their O or B spectral type. Red circles are previously known O and B stars with classifications available in the literature; dark blue squares are stars newly found in the current study and spectroscopically confirmed as having O or B types; and light blue triangles are photometrically selected candidate O and B stars without available spectroscopy. The field is 6° × 4°, Galactic latitude increasing toward the top and Galactic longitude toward the left.