Spatial comparison in channel maps of log (∫T(SiO)dv / ∫T(HCO + )dv). The velocity intervals are indicated in each frame. The contours correspond to the HCO+ emission at 3σ and 30σ. We can identify clearly regions where either the SiO (e.g. in the 1.3 complex and in the M+3.2+0.3 cloud) or HCO+ (e.g. towards Sgr A region) dominate.
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