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Fig. 1

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Images of IRAS4A at 1.2 mm, 2.1 mm, and 9.1 mm imaged at 78 mas resolution. The central RA and Dec positions for Band 4 and Band 6 are 03:29:10.510 and +31.13.31.010, respectively. For the VLA image, the central Dec position is 03:29:10.502 and the central RA position remains the same, aligning with +31.13.31.010. Both sources are visible at a separation of 1.8″, with some surrounded leftover emission seen between them at 1.2 and 2.1 mm but not at 9.1 mm (see Fig. A.1, where the image color scale was changed to show the extended emission). Moreover, the peak emission of IRAS4A2 is larger than that of IRAS4A1 at 1.2 mm. The emission of both sources in the VLA image is more radially compact, though it is very faint for IRAS4A2.

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