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J/ApJ/776/136
  QPQ VI. HI absorption of z∼2 quasars (Prochaska+, 2013)
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1.J/ApJ/776/136/qpq6(c)Quasars Probing Quasars VI (QPQ6) redshifts and HI measurements (tables 1, 3 and 4) (646 rows)
2.J/ApJ/776/136/table2(c)Journal of observations (105 rows)
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Query by Constraints constraints help applied on Columns (Output Order: + - )
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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)f/g-Q (char) Foreground quasar identifier (meta.id;meta.main)
  (1)L912 [cW/m2/nm](n) [28/32] Log of 912Å luminosity; erg/s/cm2(Note 2)   (phys.luminosity;em.IR)
  (1)Lbol [mW/m2] (n) [45/48] Log of bolometric luminosity; erg/s/cm2 (Note 2)   (phys.luminosity)
   (ALL)b/g-Q (char) Background quasar identifier (meta.id.assoc)
  (1)zbg   [1.7/4.9] Background redshift (src.redshift;pos.heliocentric)
   (ALL)Nq  (n)Number of foreground quasars associated in QPQ6 (meta.number)
  (1)b kpc [31/999] Impact parameter R (src.impactParam)
  (1)gUV  (n) [2/17964] Enhancement in flux relative to the extragalactic UV background (Note 2)   (phot.flux;arith.ratio)
   (ALL)Inst (char) Source spectrum (Note G1)   (meta.id;instr)
  (1)Lines (char) Emission lines used in zem (meta.id;spect.line)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)zfg   [1.6/4.5] Emission line derived redshift (src.redshift;pos.heliocentric)
  (1)e_zfg km/s [272/794] Uncertainty in zfg (stat.error)
  (1)S/N   [6/205] Signal-to-noise per rest-frame Å (Note 3)   (stat.snr)
  (1)<F2000>   [0/1.2] Average flux (Note 4)   (phot.flux)
  (1)DelF   [-0.5/1] Value defined in Equ. 4 (Note 5)   (phot.flux;arith.ratio)
  (1)delv km/s (n) [-1733/1553] Velocity offset (Note 6)   (phys.veloc;arith.diff)
  (1)LWave 0.1nm (n) [3204/6615] Lower wavelength of Lyα analysis (Å) (em.wl)
  (1)UWave 0.1nm (n) [3217/6634] Upper wavelength of Lyα analysis (Å) (em.wl)
  (1)l_WLya (char) Limit flag on WLya (meta.code.error)
  (1)WLya 0.1nm (n) [0.2/23.7] Rest equivalent width (Note 7)   (spect.line.eqWidth)
  (1)e_WLya 0.1nm (n) [0.01/0.3] Uncertainty in WLya (stat.error)
  (1)l_logNH (char) Limit flag on logNH (meta.code.error)
  (1)logNH [cm-2] (n) [14.3/21.3] Log of H I column density (phys.columnDensity)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)e_logNH [cm-2] (n) [0.1/0.4] Uncertainty in logNH (stat.error)
  (1)OT  (n) [-1/1] Optical thick flag (Note 8)   (meta.code)
  (1)Qfg (char) Name of the foreground quasar in SIMBAD (meta.id)
  (1)Qbg (char) Name of the background quasar in SIMBAD (meta.id)
  (1)DR9Q  (n)Sources from Paris+, 2012, VII/269, within 2" (meta.ref.url)
  (1)Obs  (n)Display the observation log (meta.code)
   (ALL)Sloan (char) Display the online SDSS data for the nearest object (meta.ref.url)
  (1)Simbad (char) ask the Simbad data-base about this object (meta.ref.url)
   (ALL)_RA deg (i) Postion of foreground quasar (from f/g-Q identifier (right ascension part) (pos.eq.ra;meta.main)
   (ALL)_DE deg (i) Postion of foreground quasar (from f/g-Q identifier (declination part) (pos.eq.dec;meta.main)
  (2)Obs (char) Observatory (meta.id;instr.obsty)
  (2)Date "Y:M:D" (n)Observation date (Note 3)   (time.epoch;obs)
  (2)Exp s [300/16800] Exposure time (Note 4)   (time.duration;obs.exposure)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
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