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Table 1

Parameters of our observations.

Molecular line 13CO (J = 1–0) C18O (J = 1–0)

Rest frequency [GHz] 110.201354 109.782176
Observation 2013 May 2010 March–2013 May
Scan mode OTF OTF
Mapping size [deg2] 0.4 0.4
Effective beam size [] 25.8 25.8
Velocity resolution [km s-1] 0.3 0.3
Typical noise level in TMB [K] 0.7 0.2

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