L1551 NE from the VLA observations (contours + colour scale) as follows: (a) the VLA 6 GHz image. (b) the VLA 10 GHz image (c) the VLA 13.5 GHz image (d) the VLA 17.5 GHz image (e) the VLA 20 GHz image (f) the VLA 24 GHz image. The black crosses in each image indicate the peaks of the disk emission of the two sources in the 24 GHz image to show the approximate positions of the central stars. The jet axes of the two components from Reipurth et al. (2002) are shown by the dotted white lines. The contour levels in the 6 GHz image are −3, 3, 4, 5, 6, 7, 8, and 9 × σ_rms, where σ_rms is the root-mean-square noise of the image. For the 10 GHz image, the contour levels are −3, 3, 4, 5, 6, 7, 8, 9, and 10 × σ_rms. For the 13.5 GHz and 17.5 GHz images, the contour levels are −3, 3, 10, 20, 30, 40, 50, and 60 × σ_rms. For the 20 GHz image, the contour levels are −3, 3, 5, 10, 15, 20, 25, 30, 35, and 40 × σ_rms. For the 24 GHz image, the contour levels are −3, 3, 5, 10, 15, 20, 25, 30, and 35 × σ_rms. The synthesised beam for each image is shown in the bottom left corner. The values for the synthesised beam and σ_rms of each image are given in Table 4.