benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 p540, 2000-09-16,  CWW ,   ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16364,  NONE, 1.3863, 1.4338, 30, 161930
 p540, 2000-09-19,  CWW ,   ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16364,  NONE, 1.4226, 1.4698, 30, 154730
 p540 P540_USGS, 2009-09-15,  SRW ,  USGS ,  ASHTECH,  04579 ,  Z-XII 1L001,  ASH701945B_M,  CR519993706,  NONE, 1.4247, 1.4719, 30, 16510
 p540 P540_USGS, 2009-09-16,  CWW ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII 1L001,  ASH700936D_M,  CR14330,  NONE, 1.4479, 1.4949, 30, 155730