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Fig. 1.


5 GHz contour maps. The contour levels are ±3, 6, 12, and 24 times the rms given in Table 3. The synthesized beam is shown in the lower left corner of each plot. For UGC 3193 the maser disk size; for Mrk 1210 the maser disk size and orientation; and for Mrk 0001, Mrk 1419, and NGC 2273 the maser disk size, orientation, position, and position uncertainties (light orange squares) are shown. For Mrk 0001 the maser position uncertainty is small. For Mrk 1210 and UGC 3193 the positions of the maser disks are not yet known. For NGC 2273, two contour maps using different Briggs weighting functions are shown: robust parameter 5, which is a pure natural weighting (left panel) and 0, which is between natural and uniform (right panel).

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