Fig. 2

From top to bottom: spatial coverage of the observations in SiO
and H13CO+ (HCO+ has uniform sampling
of ). Emission integrated over velocity
from − 230 to 270 kms-1 for the region measured in HCO+. The
solid contour levels start at 1.9 K kms-1 (3σ) and
increase in steps of 12.53 K kms-1 (20σ). Emission
integrated over velocity from − 140 to 190 kms-1 for the region measured
in SiO. The solid contours start at 1.09 K kms-1 (3σ)
and increase in steps of 5.46 K kms-1 (15σ). Emission
integrated over velocity from − 100 to 120 kms-1 for the region measured
in H13CO+. The solid contours start at 0.89 K kms-1
(3σ) and increase in steps of 2.97 K kms-1
(10σ). In all plots, the dashed line shows the coverage of the
survey in each molecule. For a better display of the observations, we choose the
velocity integration range in each spectral line to cover only the emission visible
in the respective longitude-velocity diagram.
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