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Table 2

Observing log for the SMA observations exploited in this paper.

Date Targets Setup Flux of 1744312

2009 June 2 Sgr C, Sgr D 4 GHza, 0.44 km s-1 0.23 mJy
2009 June 4 G0.253+0.016 4 GHza, 0.44 km s-1 0.28 mJy
2012 May 29 50 km s-1, Sgr B1 Off 8 GHzb, 0.87 km s-1 0.23 mJy
2012 May 30 20 km s-1 8 GHzb, 0.87 km s-1 0.20 mJy

Notes.

(a)

Frequencies of 277.8 to 279.8 GHz and 287.8 to 289.8 GHz;

(b)

frequencies of 275.8 to 279.8 GHz and 287.8 to 291.8 GHz.

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