Spectra around the ¹²CO v = 1−0 P(8) and ¹³CO v = 1−0 R(10) lines from GSS 30 seen on-source (black line), to the SW of the star (red line, multiplied by 5), and to the NE of the star (blue, multiplied by 5). The off-source spectra are extracted from from the central source. The 2D spectral images are obtained from coadding images over ¹²CO and ¹³CO lines. Both CO and continuum emission are detected off-source in both directions along the slit. The emission is strongest to the SW. The off-source CO line emission is very narrow (FWHM  ~  6.4 km s^-1) and likely suffers from CO absorption in our line of sight.