benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 trac TracPort_1987_NGS, 2002-03-19,  JMS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.453, 1.5, 30, 10
 trac TracPort_1987_NGS, 2002-03-20,  JMS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.453, 1.5, 30, 10
 trac TracPort_1987_NGS, 2005-02-23,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022602,  NONE, 1.5416, 1.5879, 30, 0
 trac TracPort_1987_NGS, 2005-02-24,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022602,  NONE, 1.5416, 1.5879, 30, 0
 trac TracPort_1987_NGS, 2012-02-15,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 1.0221, 1.0739, 15, 0
 trac TracPort_1987_NGS, 2012-02-16,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 1.0221, 1.0739, 15, 0