GBT spectrum of the H i filament. The dashed line indicates the best fitting single-component Gaussian fit to the line with a peak of 19 ± 2 mK, a center of 122.2 ± 2.4 km s ⁻¹, and an FWHM line width of 54.5 ± 5.7 km s ⁻¹. H i emission associated with the Milky Way spans V _☉ = −170–50 km s ⁻¹.