Rotation speed derived from Eq. (8) as a function of R for different z, with Δz = 400 pc; correction of systematic errors of proper motions included; adopting a solar azimuthal speed of Vg, ⊙ = 250 km s-1 and a LSR azimuthal speed of Vc(R⊙,z = 0) = 238 km s-1. Error bars include statistical errors, uncertainties in (U⊙,Vg, ⊙,W⊙), and errors of the systematic errors of proper motion and contamination of non-RCGs (see Fig. 4 for the distribution of errors for z = 0).
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