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Fig. 3

image

Comparison of column densities of O i (blue), OH (black and gray filled) and OH+ (red, scaled by a factor 10) for sightlines to continuum sources in the first quadrant. The velocity range spanned by OH and CH3OH masers in the hot cores is indicated by the green-hashed area. Velocity channels coinciding with the telluric or saturated O i absorption are masked.

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