benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 minn Minn_unstamped_1990, 1992-02-20,  CHS ,  USGS ,  ASHTECH,  764 ,  LM-XII3 6A,  ASH700228A,  0598,  NONE, 1.7113, 1.7565, 30, 7570
 minn Minn_unstamped_1990, 1993-01-20,  CHS ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 6M24,  ASH700228A,  1027,  NONE, 1.4382, 1.4853, 30, 113030
 minn, 1994-04-26,  CHS ,  USGS ,  ASHTECH,  99 ,  LM-XII3 7A,  ASH700228D,  1036,  NONE, 1.605, 1.6509, 30, 13470
 minn Minn_unstamped_1990, 1995-06-28,  CHS ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 1E00,  ASH700228A,  0598,  NONE, 1.5969, 1.6428, 30, 15450
 minn Minn_unstamped_1990, 1996-06-11,  CHS ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1F00,  ASH700718B,  11416,  NONE, 1.6601, 1.7056, 30, 153330
 minn Minn_unstamped_1990, 1997-12-11,  CHS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.6523, 1.6978, 30, 162430
 minn Minn_unstamped_1990, 1997-12-17,  JMS ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 1E95,  ASH700936D_M,  CR14341,  NONE, 1.5999, 1.6458, 30, 17630
 minn Minn_unstamped_1990, 2005-03-15,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 1.7469, 1.7919, 30, 162130
 minn Minn_unstamped_1990, 2005-03-16,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 1.754, 1.7989, 30, 16430
 minn Minn_unstamped_1990, 2012-02-22,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.7479, 1.7929, 15, 171245
 minn Minn_unstamped_1990, 2018-01-10,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  JAVRINGANT_DM,  00585,  NONE, 1.7158, 1.761, 15, 18330
 minn Minn_unstamped_1990, 2018-01-11,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  JAVRINGANT_DM,  00585,  NONE, 1.7258, 1.7709, 15, 144730