Fig. 2
Left upper panel: maser emission in reference channel (59.3 km s-1). Right upper, left and right lower panel: compact emission of the three background quasars J1808−1822, J1809−1520, and J1825−1718, which were phase-referenced to the reference maser channel. The images are obtained from epoch 2011 May 21. The contour levels are 10 to 100 % in steps of 10 % of the maximum in each panel (G012.68−0.18: 132.5 Jy beam-1, J1808−1822: 12.3 mJy beam-1, J1809−1520: 22.1 mJy beam-1, J1825−1718: 96.1 mJy beam-1). The restoring beam is shown in the lower left corner.
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