benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 pl20, 1999-09-14,  CWW ,   ,  ASHTECH,  174 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 1.4912, 1.5378, 30, 155230
 pl20, 1999-09-24,  CWW ,   ,  ASHTECH,  174 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 1.353, 1.4008, 30, 155230
 pl20 PL20_stmpd_PLS_2033_, 2003-06-19,  WCH ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.1357, 1.1859, 30, 15480
 pl20 PL20_stmpd_PLS_2033_, 2003-06-30,  VDB ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14244,  NONE, 1.1307, 1.1809, 30, 15480
 pl20 PL20_stmpd_PLS_2033_, 2008-09-13,  CWW ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII 1L00,  ASH700936D_M,  CR14329,  NONE, 1.456, 1.5029, 30, 15830
 pl20 PL20_stmpd_PLS_2033_, 2008-09-19,  WRT ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 1.2662, 1.3149, 30, 17220
 pl20 PL20_stmpd_PLS_2033_, 2013-09-12,  JLS ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993703,  NONE, 1.1874, 1.2369, 15, 152615