Fig. 2
Up: HI spectra obtained towards the source G35.6 (NVSS 185929+020334). Bottom: HI spectra obtained towards the source NVSS 185938+020012. The spectra obtained towards the sources (the On position) are presented in red, and in blue we present the averaged HI emission taken from four positions separated approximately by a beam from the source in the direction of the four Galactic cardinal points (the Off position), and the subtractions between them are presented in black. The 3σ uncertainty in the subtraction is ~10 K.
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