Rotation speed as a function of R for bins with |z| < 200 pc, adopting a solar azimuthal speed of Vg, ⊙ = 250 km s-1 and an LSR azimuthal speed of Vc(R⊙,z = 0) = 238 km s-1. The dashed line is the weighted average of the bins without correction of systematic errors of the proper motion but taking into account the errors due to contamination of non-RCGs and including errors due to uncertainties in (U⊙,Vg, ⊙,W⊙). The solid line is the weighted average of the bins including the correction of systematic errors of the proper motion as explained in Sect. 5; error bars include statistical errors, uncertainties in (U⊙,Vg, ⊙,W⊙), errors due to contamination of non-RCGs and errors of systematic errors of proper motion (see Fig. 4).
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