Fig. A.1.
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3D representation of the kinematic data of IZw18. Top row: MB. Middle row: NE halo. Bottom row: SW halo. Left column: Data from the single-component fit. Middle column: Data from the principal double-component fit. Right column: Data from the secondary double-component fit. Each 3D figure presents the following features: The x and y axis correspond to the position of the galaxy in arcseconds. The z axis (vertical axis) represents the normalized luminosity. The colorbar corresponds to the measured velocity, and the size of each point is related to the velocity dispersion (as indicated in the top-left legend in each 3D figure).
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