benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 pozo L561_1957_USC&GS, 1994-11-02,  Z. SHEN ,  UCLA ,  TRIMBLE 4000,  1051,  SST,  TRM14532.00,  271,  NONE, 0.9839, 0, 30, 11530
 pozo L561_1957_USC&GS, 1994-11-03,  Z. SHEN ,  UCLA ,  TRIMBLE 4000,  1051,  SST,  TRM14532.00,  271,  NONE, 0.9839, 0, 30, 130
 pozo L561_1957_USC&GS, 1994-11-04,  Z. SHEN ,  UCLA ,  TRIMBLE 4000,  1051,  SST,  TRM14532.00,  271,  NONE, 0.9839, 0, 30, 130
 pozo L561_1957_USC&GS, 2008-05-07,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14341,  NONE, 1.2086, 1.2579, 30, 15560
 pozo L561_1957_USC&GS, 2008-05-10,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 1.1823, 1.2319, 30, 16190
 pozo L561_1957_USC&GS, 2010-03-28,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945B_M,  CR519993706,  NONE, 0.7535, 0.8109, 15, 16445
 pozo L561_1957_USC&GS, 2010-03-30,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 1.2794, 1.3279, 15, 16250
 pozo L561_1957_USC&GS, 2011-03-23,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 1.3612, 1.4089, 15, 154345
 pozo L561_1957_USC&GS, 2011-03-24,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 1.242, 1.2909, 15, 153815
 pozo L561_1957_USC&GS, 2011-10-22,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.3349, 1.3829, 15, 152645
 pozo L561_1957_USC&GS, 2011-10-23,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.2582, 1.3069, 15, 152845
 pozo L561_1957_USC&GS, 2015-05-28,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993702,  NONE, 0.7607, 0.8179, 15, 161115
 pozo L561_1957_USC&GS, 2015-05-29,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993702,  NONE, 0.7607, 0.8179, 15, 0