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  VBLA observations of W51 Main/South (Sato+, 2010)
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1.J/ApJ/720/1055/table3H2O maser feature motions in W51 Main/South (37 rows)
2.J/ApJ/720/1055/table4Maser spot motions in W51 Main/South (123 rows)

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Column  Constraint Explain   (UCD)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  (1)Reg (char) Region identification (Note 1)   (;obs.field)
   (ALL)ID  (i) [1/37] Maser feature number (meta.number;phys.atmol.number;meta.main)
   (ALL)Vlsr km/s LSR velocity (phys.veloc;pos.lsr)
   (ALL)Tb Jy Brightness temperature in units of Jy/beam (Note 2)   (phot.flux.density;arith.ratio)
   (ALL)x0 arcsec X position relative to feature 32 (Note 3)   (pos.cartesian.x;pos.galactocentric)
   (ALL)e_x0 arcsec Uncertainty in x0 (stat.error)
   (ALL)y0 arcsec Y position relative to feature 32 (Note 3)   (pos.cartesian.y;pos.galactocentric)
   (ALL)e_y0 arcsec Uncertainty in y0 (stat.error)
   (ALL)pmx mas/yr Proper motion along X (Note 4)   (;pos.cartesian.x)
   (ALL)e_pmx mas/yr Uncertainty in pmx (stat.error)

ALL cols
 (i)indexed column
   (ALL)pmy mas/yr Proper motion along Y (Note 4)   (;pos.cartesian.y)
   (ALL)e_pmy mas/yr Uncertainty in pmy (stat.error)
  (2)Num   [1/7] IDs of the component spots in different velocity channels for each feature (pos.cartesian)

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