benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 obsd, 1999-09-17,  GDH ,   ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.1791, 1.2287, 30, 1640
 obsd, 1999-09-21,  GDH ,   ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.1822, 1.2318, 30, 15480
 obsd Obsd_Z49_1934_USC&GS, 2008-09-18,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH701945E_M,  CR620022605,  NONE, 0.5909, 0.6539, 30, 0
 obsd Obsd_Z49_1934_USC&GS, 2008-09-19,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH701945E_M,  CR620022605,  NONE, 0.5909, 0.6539, 30, 0
 obsd Obsd_Z49_1934_USC&GS, 2013-09-13,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14330,  NONE, 0.5595, 0.6239, 15, 175145
 obsd Obsd_Z49_1934_USC&GS, 2013-09-14,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14330,  NONE, 0.5595, 0.6239, 15, 0
 obsd Obsd_Z49_1934_USC&GS, 2013-09-15,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14330,  NONE, 0.5595, 0.6239, 15, 0