Fig. B.2.
Channel maps of the central peak of the CO spectral line, zooming in on the bright central region. The contours are drawn at 10, 15, 20, … 85, and 90 times the rms noise value outside the line (1.25 × 10−3 Jy beam−1). The continuum brightness peak is indicated with the yellow star. The density of contours exhibits the high degree of structure in the spiral formation zone.
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