Upper: position-velocity diagram along the major axis of the edge-on galaxy NGC 7814. The squares show the rotation curves derived separately for the approaching and the receding side. The contour levels are: 0.5, 1, 2, 4, 10, 20 mJy beam-1. Lower: position-velocity diagram along the major axis for the model galaxy. 1 arcmin = 4.25 kpc.
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