Spectrum of the H I optical depth towards the UCH II region G34.256+0.146 using the THOR data. For some channels, the absorption spectra saturates and the measured optical depth is a lower limit of τ = 3.5, which is indicated by the dotted line. The gray shaded area indicates the velocity range of the HISA feature (vLSR = 50−60 km s−1).
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