benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 tomb, 1998-09-08,  MAXWELL L MCCREADY ,  NATIONAL GEODETIC SU,  TRIMBLE 4000SSE,  4871,  Nav,  TRM22020.00+GP,  249,  NONE, 2, 0, 15, 175315
 tomb, 1998-09-09,  MAXWELL L MCCREADY ,  NATIONAL GEODETIC SU,  TRIMBLE 4000SSE,  4871,  Nav,  TRM22020.00+GP,  249,  NONE, 2, 0, 15, 134845
 tomb, 1998-09-11,  JUSTIN DAHLBERG ,  NATIONAL GEODETIC SU,  TRIMBLE 4000SSE,  4869,  Nav,  TRM22020.00+GP,  76725,  NONE, 2, 0, 15, 134715
 tomb, 2001-09-05,  CHS ,   ,  ASHTECH,  lp020000801 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3722, 1.4198, 30, 15340
 tomb, 2001-09-11,  APS ,   ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993706,  NONE, 1.2014, 1.2507, 30, 15570
 tomb Tomb_1989_NGS, 2005-09-09,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 1.3531, 1.4009, 30, 15240
 tomb Tomb_1989_NGS, 2005-09-13,  HRY ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031622,  NONE, 1.3006, 1.3489, 30, 154630
 tomb Tomb_1989_ODOT_NGS, 2010-09-10,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR520031626,  NONE, 1.3299, 1.3779, 15, 152645
 tomb Tomb_1989_ODOT_NGS, 2010-09-11,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH701945B_M,  CR519993702,  NONE, 1.5739, 1.62, 15, 154845