benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 twor TwoRock_1879_1925_USC, 1994-06-20,   ,   ,  TRIMBLE 4000,  5685,  SSE,  TRM14532.00,  136,  NONE, 1.1234, 0, 30, 35530
 twor TwoRock_1879_1925_USC, 1994-06-21,   ,   ,  TRIMBLE 4000,  5685,  SSE,  TRM14532.00,  136,  NONE, 1.1234, 0, 30, 30
 twor TwoRock_1879_1925_USC, 1994-06-22,   ,   ,  TRIMBLE 4000,  5685,  SSE,  TRM14532.00,  136,  NONE, 1.1234, 0, 30, 30
 twor TwoRock_1879_1925_USC, 1994-06-23,   ,   ,  TRIMBLE 4000,  5685,  SSE,  TRM14532.00,  136,  NONE, 1.1234, 0, 30, 30
 twor TwoRock_1879_1925_US, 2010-11-16,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992805,  NONE, 0.9183, 0.9719, 15, 181445
 twor TwoRock_1879_1925_US, 2010-11-17,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992805,  NONE, 0.9183, 0.9719, 15, 0
 twor TwoRock_1879_1925_US, 2010-11-18,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992805,  NONE, 0.9183, 0.9719, 15, 0
 twor TwoRock_1879_1925_US, 2012-07-14,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.7936, 0.8499, 15, 0
 twor TwoRock_1879_1925_US, 2012-07-15,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.7936, 0.8499, 15, 0
 twor TwoRock_1879_1925_US, 2012-07-16,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.7936, 0.8499, 15, 0
 twor TwoRock_1879_1925_US, 2013-06-06,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.9591, 1.0119, 15, 0
 twor TwoRock_1879_1925_US, 2013-06-07,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.9591, 1.0119, 15, 0