benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 mddf, 2001-06-07,  JMS ,   ,  ASHTECH,  LP00108.707 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993706,  NONE, 0.6261, 0.6876, 30, 15400
 mddf Mid-F_1974_DMG, 2001-06-08,  JMS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993706,  NONE, 0.6261, 0.6876, 30, 10
 mddf Mid-F_1974_DMG, 2003-03-26,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 1.2814, 1.3299, 30, 16180
 mddf Mid-F_1974_DMG, 2003-03-27,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 1.2814, 1.3299, 30, 10
 mddf Mid-F_1974_DMG, 2005-04-28,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 0.5658, 0.6299, 30, 0
 mddf Mid-F_1974_DMG, 2005-04-29,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 0.5658, 0.6299, 30, 0
 mddf Mid-F_1974_DMG, 2005-04-30,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 0.5658, 0.6299, 30, 0
 mddf Mid-F_1974_DMG, 2006-05-17,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.6055, 0.6679, 30, 0
 mddf Mid-F_1974_DMG, 2006-05-18,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.6065, 0.6688, 30, 0
 mddf Mid-F_1974_DMG, 2006-05-19,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.6065, 0.6688, 30, 0
 mddf Mid-F_1974_DMG, 2008-05-07,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 0.7195, 0.7778, 30, 0
 mddf Mid-F_1974_DMG, 2008-05-08,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 0.7195, 0.7778, 30, 0
 mddf Mid-F_1974_DMG, 2008-05-09,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 0.7195, 0.7778, 30, 0
 mddf Mid-F_1974_DMG, 2016-05-18,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.5.1,  JAVRINGANT_DM,  00574,  NONE, 0.9336, 0.9869, 15, 17170
 mddf Mid-F_1974_DMG, 2016-05-19,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.5.1,  JAVRINGANT_DM,  00574,  NONE, 0.9336, 0.9869, 15, 0
 mddf Mid-F_1974_DMG, 2016-05-20,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.5.1,  JAVRINGANT_DM,  00574,  NONE, 0.9336, 0.9869, 15, 0
 mddf Mid-F_1974_DMG, 2016-05-21,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.5.1,  JAVRINGANT_DM,  00574,  NONE, 0.9336, 0.9869, 15, 0