2D reduced spectrum of AV-251 (left) and AV-6 (right), revealing a faint companion 1″ below the spectrum of AV6. The overlaid grid indicates the wavelength axis (horizontal, in nm) and the spatial axis (vertical, in arcsec from the center of the slit). The default science and sky extraction windows and those adopted for AV-6 in this work are overlaid on the 2D spectrum. The color bar indicates the ADU level in the images (in log scale). The cross sections along the spatial direction are in units of ADU (in linear scale).