#x (kpc)   v (km/s)  v_err (km/s)
 -7.18 -107.55    7.78
 -6.50 -112.58    7.37
 -5.82 -111.01    7.37
 -5.14 -112.58    7.37
 -4.46 -111.84    7.37
 -3.78 -103.02    7.37
 -3.10  -91.97    7.37
 -2.42  -62.29    7.37
 -1.74  -42.89    7.37
 -1.06  -21.51    7.37
 -0.38   -4.91    7.37
  0.30   10.64    7.37
  0.98   22.27    7.37
  1.66   31.44    7.37
  2.34   57.51    7.37
  3.02   77.75    8.88
  3.70   87.43    8.03
  4.38   94.56    8.91
  6.01  117.27    9.17