#x (kpc)   v (km/s)  v_err (km/s)
 -4.00   88.32   23.20
 -3.32   92.20   12.06
 -2.64   90.11    8.69
 -1.96   76.87    7.37
 -1.28   57.06    7.37
 -0.60   31.35    7.37
  0.08    4.04    7.37
  0.76  -24.32    7.37
  1.44  -50.21    7.37
  2.12  -76.28    7.37
  2.80  -92.64    7.37
  3.48 -104.09    7.37
  4.16 -110.88    7.37
  4.84 -115.38    7.37
  5.52 -115.38    7.37
  6.20 -110.35    7.37
  6.88 -114.95    8.87