Central 7 mosaic fields of the 12 m-Array observations. The black circle shows the field (FWHM) centered on Sgr A*. Gray circles show the 6 fields which are the nearest to the central one. The diameter of these circles is . The IDs of the fields which are covered in the same target source scan (i.e. a target source scan is defined by a time period bracketed by two scans on gain calibrator) are labeled with the same color. These fields were observed in a time sequence of 18→25→0→94→101→133→134 (see also Fig. 2).
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