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Fig. 4

image

Left: H I absorption profile from the VLA data. The shallow broad absorption is visible at velocities below ~12 250 km s-1. The dashed line indicate the systemic velocity of Mrk 231. Right: zoom-in of the H I absorption profile from the VLA data that shows the blueshifted wing more clearly. Superposed is the Gaussian fit of the broad component discussed in the text.

This figure is made of several images, please see below:

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