Orientation of the best plane (X′,Y′) that minimizes the velocity component (VZ′) of the CH3OH masers perpendicular to the plane. Upper panel: left and right plots show a view of the best plane as projected on the plane of the sky and with respect to the line of sight, respectively. Lower panel: ratio of the velocity components perpendicular (VZ′) and parallel (Vp) to the best plane, plotted for each maser cloudlet (grouped by clusters). Error bars give the 1σ uncertainty of the ratio VZ′/Vp. The dotted line marks the weighted average of VZ′/Vp (with its uncertainty), which corresponds to an average deviation of 12° away from the best plane.
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