benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 grvw GRVW_00_USGS, 2006-11-16,  JMS ,  USGS ,  ASHTECH Z-X,  ZE120023204,  ZE21,  ASH700936D_M,  CR14333,  NONE, 0.6585, 0.7188, 30, 17230
 grvw GRVW_00_USGS, 2006-11-17,  JMS ,  USGS ,  ASHTECH Z-X,  ZE120023204,  ZE21,  ASH700936D_M,  CR14333,  NONE, 0.6647, 0.7248, 30, 165930
 grvw GRVW_00_USGS, 2008-07-15,  JMS ,  USGS ,  ASHTECH Z-XII,  LP00108.707,  1L00,  ASH700936D_M,  CR14341,  NONE, 1.463, 1.5099, 30, 16250
 grvw GRVW_00_USGS, 2008-07-16,  JMS ,  USGS ,  ASHTECH Z-XII,  LP00108.707,  1L00,  ASH700936D_M,  CR14341,  NONE, 1.5336, 1.58, 30, 16030
 grvw GRVW_00_USGS, 2008-07-30,  JMS ,  USGS ,  ASHTECH Z-X,  ZE120023202,  ZE21,  ASH701945E_M,  CR620022605,  NONE, 1.59, 1.636, 30, 16130
 grvw GRVW_00_USGS, 2009-08-12,  JMS ,  USGS ,  ASHTECH Z-X,  ZE120023208,  ZE210A13,  ASH701945E_M,  CR520031622,  NONE, 0.8376, 0.8929, 30, 16360
 grvw GRVW_00_USGS, 2009-08-20,  CHS ,  USGS ,  ASHTECH Z-X,  ZE1200331018,  ZE210A13,  ASH700936D_M,  CR14329,  NONE, 0.6813, 0.7408, 30, 16630
 grvw GRVW_00_USGS, 2010-06-22,  JMS ,  USGS ,  ASHTECH Z-X,  ZE1200331017,  ZE210A13,  ASH701945E_M,  CR620022601,  NONE, 1.4822, 1.5289, 15, 155915
 grvw GRVW_00_USGS, 2010-06-24,  JMS ,  USGS ,  ASHTECH Z-X,  ZE1200331017,  ZE210A13,  ASH700936D_M,  CR14329,  NONE, 0.9316, 0.9849, 15, 16415
 grvw GRVW_00_USGS, 2018-06-21,  JLS ,  USGS ,  JAVAD TRE_G3TH,  00588,  SIGMA3.5.14,  ASH701945B_M,  CR619992805,  NONE, 0.7164, 0.7749, 15, 163545
 grvw GRVW_00_USGS, 2018-06-22,  JLS ,  USGS ,  JAVAD TRE_G3TH,  00588,  SIGMA3.5.14,  ASH701945B_M,  CR619992805,  NONE, 0.7164, 0.7749, 15, 0