benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 a435, 2000-09-15,  CHS ,   ,  ASHTECH,  801 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.4377, 1.4848, 30, 15270
 a435, 2000-09-17,  CHS ,   ,  ASHTECH,  801 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.4357, 1.4828, 30, 153030
 a435, 2004-09-17,  JLS ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE00,  ASH701945B_M,  CR619992805,  NONE, 1.1681, 1.2179, 30, 134530
 a435 A435_unstmpd_NGS, 2004-09-20,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH701945E_M,  CR520031615,  NONE, 1.4691, 1.5159, 30, 16030
 a435 A435_unstmpd_NGS, 2005-05-24,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 0.5289, 0.5948, 30, 14340
 a435 A435_unstmpd_NGS, 2005-05-26,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 1.4156, 1.4629, 30, 152630
 a435 A435_unstmpd_NGS, 2009-09-15,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.6854, 0.7448, 30, 14530
 a435 A435_unstmpd_NGS, 2009-09-18,  JLS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 0.6813, 0.7408, 30, 135845
 a435 A435_unstmpd_NGS, 2017-06-14,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  ASH701945E_M,  CR520031622,  NONE, 0.7494, 0.8069, 15, 13470
 a435 A435_unstmpd_NGS, 2017-06-17,  ELP ,  USGS ,  JAVAD,  01657 ,  TRE_G3TH SIGMA3.5.1,  ASH701945B_M,  CR519993703,  NONE, 0.8785, 0.9328, 15, 124445
 a435 A435_unstmpd_NGS, 2020-07-30,  ELP ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.7.6,  TRM57971.00,  1441138325,  NONE, 0.8018, 0.863, 15, 13045
 A435, 2020-09-24,  JLS ,  USGS ,  TRIMBLE,  4927175157 ,  NETRS 1.3-2,  TRM57971.00,  1440925376,  NONE, 0.8366, 0.8972, 15, 18570
 A435, 2020-09-25,  JLS ,  USGS ,  TRIMBLE,  4927175157 ,  NETRS 1.3-2,  TRM57971.00,  1440925376,  NONE, 0.8366, 0.8972, 15, 0