benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 p515, 2000-09-14,  APS ,   ,  ASHTECH,  174 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 0.3416, 0.4215, 30, 143430
 p515, 2000-09-18,  CWW ,   ,  ASHTECH,  188 ,  Z-XII3 CD00,  ASH700936E_C,  CR16381,  NONE, 1.2034, 1.2527, 30, 152030
 p515, 2004-09-24,  RWB ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.2116, 1.2609, 30, 155930
 p515, 2004-09-27,  WRT ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.245, 1.2939, 30, 11630
 p515 P515_stamped_P015_US, 2009-09-18,  SAH ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII 1L001,  ASH701945E_M,  CR520031622,  NONE, 1.2844, 1.3329, 30, 16340
 p515 P515_stamped_P015_US, 2009-11-13,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 0.5815, 0.6449, 30, 172545
 p515 P515_stamped_P015_US, 2009-11-14,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 0.5815, 0.6449, 30, 0