Simultaneous AGA fit of components DoAr21b and DoAr21B using the combined model, and fitting simultaneously both components (see Section 4.3). Left. The upper panels show the parallax after removing proper motions and the orbital contribution of both components. The next two panels show the orbit of DoAr21b after removing proper motions, parallax and the contribution of DoAr21B. The lower panels show the orbit of DoAr21B after removing proper motions, parallax and the contribution of DoAr21b. The black dots correspond to the observed astrometric data with their error bars. The red crosses indicate the expected position at the observed epochs. The R.A. and decl. offsets are relative to the estimated barycenter position of the source. Right: the solid lines show the orbits of components DoAr21b and DoAr21B around the host star. The open circles indicate the estimated positions of DoAr21b with respect to the host star (black star at the center of the orbits), and the red crosses indicate the predicted positions along the orbit at the observed epochs. The red dots indicate the positions of the observed companion. The error bars of this data points are smaller than the size of the dot. In the case of DoAr21b, there is an excellent agreement between the observed positions and the predicted positions. The arrow indicates the direction of the movement of DoAr21b along its orbit. Note that the orbit of DoAr21B is eccentric and perpendicular to the plane of the sky.