#x (kpc)   v (km/s)  v_err (km/s)
 -4.56 -114.78    9.29
 -1.61  -49.08   15.81
 -0.11  -16.37   28.08
  0.65   47.19   23.85
  1.79  108.86   16.20
  3.30   96.21   15.67
  4.45  110.01   29.26
  5.95  156.01   14.65
  8.60  153.33   15.25