benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 nws1 NWS_Elev_5568.7_1990, 2003-09-17,  WCH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.1641, 1.2139, 30, 17300
 nws1 NWS_Elev_5568.7_1990, 2003-09-18,  WCH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.1641, 1.2139, 30, 10
 nws1 NWS_Elev_5568.7_1990, 2003-09-19,  WCH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.1641, 1.2139, 30, 10
 nws1 NWS_Elev_5568.7_1990, 2007-09-21,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR620022602,  NONE, 1.154, 1.2039, 30, 0
 nws1 NWS_Elev_5568.7_1990, 2007-09-22,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR620022602,  NONE, 1.154, 1.2039, 30, 0
 nws1 NWS_Elev_5568.7_1990, 2007-09-23,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR620022602,  NONE, 1.154, 1.2039, 30, 0
 nws1 NWS_Elev_5568.7_1990, 2011-09-16,  SW ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 0.7807, 0.8373, 15, 4045
 nws1 NWS_Elev_5568.7_1990, 2011-09-28,  SAH ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH701945B_M,  CR519993706,  NONE, 1.2036, 1.2529, 15, 15415
 nws1 NWS_Elev_5568.7_1990, 2015-09-16,  ELP ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6896, 0.7489, 15, 0
 nws1 NWS_Elev_5568.7_1990, 2015-09-17,  ELP ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6896, 0.7489, 15, 0
 nws1 NWS_Elev_5568.7_1990, 2015-09-18,  ELP ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6896, 0.7489, 15, 0
 nws1 NWS_Elev_5568.7_1990, 2015-09-19,  ELP ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6896, 0.7489, 15, 0