#x (kpc)   v (km/s)  v_err (km/s)
 -4.14  -98.99    9.35
 -2.26  -67.41    9.35
 -1.51  -56.65    9.35
 -0.75  -34.08    9.35
  0.00   -5.09    9.35
  0.75   14.76    9.35
  1.51   46.03    9.35
  2.26   65.30    9.35
  3.02   77.88    9.35
  3.77   90.55    9.35
  4.52  100.00    9.35
  5.28   91.47    9.35
  6.03  108.72    9.35
  6.78  108.47    9.35
  7.54   97.47    9.35