benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 rett R_E_T_1989__NCER, 1993-07-15,  WKG ,  USGS ,  ASHTECH LM-XII3,  765,  7A26,  ASH700228D,  1058,  NONE, 1.2302, 1.2792, 30, 231430
 rett R_E_T_1989__NCER, 1992-08-12,  WKG ,  USGS ,  ASHTECH,  99 ,  LM-XII3 7A,  ASH700228D,  1036,  NONE, 1.3891, 1.4366, 30, 18580
 RETT, 1994-07-31,  CHS ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A,  ASH700228D,  1058,  NONE, 1.5016, 1.5482, 30, 144830
 rett R_E_T_1989__NCER, 1996-07-19,  KAS ,  USGS ,  ASHTECH,  707 ,  Z-XII3 1F00,  ASH700718B,  11404,  NONE, 1.4205, 1.4677, 30, 153330
 rett R_E_T_1989__NCER, 1996-07-20,  JLS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 1F00,  ASH700228D,  1068,  NONE, 1.1487, 1.1987, 30, 15530
 rett R_E_T_1989__NCER, 1998-07-29,  ECB ,  USGS ,  ASHTECH,  188 ,  Z-XII3 1F50,  ASH700936E_C,  CR16376,  NONE, 1.1397, 1.1898, 30, 153130
 rett R_E_T_1989__NCER, 1998-07-30,  EEZ ,  USGS ,  ASHTECH,  203 ,  Z-XII3 1F50,  ASH700936E_C,  CR16364,  NONE, 1.1781, 1.2278, 30, 15180
 rett R_E_T_1989__NCER, 1999-07-24,  SKM ,   ,  ASHTECH,  188 ,  Z-XII3 CB00,  ASH700936E_C,  CR16376,  NONE, 1.182, 1.2316, 30, 153730
 rett R_E_T_1989__NCER, 1999-07-25,  RBG ,   ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.1022, 1.1528, 30, 16250
 rett R_E_T_1989__NCER, 2002-07-15,  BDK ,  USGS ,  ASHTECH,  LP03192 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 1.1813, 1.2309, 30, 15930
 rett R_E_T_1989__NCER, 2002-07-16,  AWL ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.1489, 1.1989, 30, 153630
 rett RET_1989__NCER, 2005-07-26,  JOL ,  USGS ,  ASHTECH,  579 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.1772, 1.2269, 30, 161730
 rett RET_1989__NCER, 2005-07-27,  CHS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031615,  NONE, 1.343, 1.3909, 30, 153430
 rett RET_1989__NCER, 2006-07-11,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.5342, 0.5998, 30, 15450
 rett RET_1989__NCER, 2006-07-12,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.5342, 0.5998, 30, 0
 rett RET_1989__NCER, 2006-07-13,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.5342, 0.5998, 30, 0
 rett RET_1989__NCER, 2007-07-14,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.7082, 0.7669, 30, 18530
 rett RET_1989__NCER, 2007-07-15,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.7082, 0.7669, 30, 0
 rett RET_1989__NCER, 2007-07-16,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.7082, 0.7669, 30, 0