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Fig. 4


Top: in color scale, the position-velocity (p-v) diagram along the galactic plane (crossing E1, E2, W2, and W1) of H(41)α. Solid contours are the 2.1 mJy/beam to 16.6 mJy/beam by 4.2 mJy/beam. As dashed lines, we plot the same contours, but centered at the frequency of CH3CN 50 → 40 line (91.987 GHz). Bottom: in color scale, the p-v dia-gram of the H2CO 20,1 → 10,1 line. For comparison, we have drawn in solid contours the levels of the CN 1 → 0 line: 10.0 mJy/beam to 86.6 mJy/beam by 20.0 mJy/beam. As dashed lines, the same contours are plotted at the frequency of the HC3N 16 → 15 line. Note that the H2CO 20,1 → 10,1 and HC3N 16 → 15 lines are heavily blended in the inner region.

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