HI spectra obtained toward G26.47+0.02 and its surroundings. The spectrum obtained toward the source (the On position) is presented in blue, in red is presented the averaged HI emission taken from four positions separated by approximately two beams from the source in the direction of the four galactic cardinal points (the Off position), and the subtractions between them is presented in black. The 3σ uncertainty of the subtraction is  ~ 8 K, which is shown with the dashed line.