Fig. 2
VLA images from epoch 2 to 7. The red circle at bottom-left is the synthesized primary beam. Contours are at −3, 2.6, and 3 times the noise level. The blue cross at the center represents the position of MWC 656. The source remains undetected in each single image. The rms of the images and upper limits for the flux density of MWC 656 are given in Table 1.
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