benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 l52x, 2003-09-14,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.4076, 1.4549, 30, 16410
 l52x L52_1948_USC&GS, 2007-09-20,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII 1L00,  ASH700936D_M,  CR14329,  NONE, 0.703, 0.7619, 30, 164130
 l52x L52_1948_USC&GS, 2007-09-24,  WRT ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3852, 1.4327, 30, 1850
 l52x L52_1948_USC&GS, 2012-09-25,  SAH ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 0.57, 0.6339, 15, 152745
 l52x L52_1948_USC&GS, 2012-09-26,  SAH ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 0.57, 0.6339, 15, 0
 l52x L52_1948_USC&GS, 2012-09-27,  SAH ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 0.57, 0.6339, 15, 0