benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 02sa HPGN_02-SA_1998_CalT, 2005-06-28,  JMS ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 1.464, 1.5109, 30, 1610
 02sa HPGN_02-SA_1998_CalT, 2005-06-29,  JMS ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 0.6263, 0.6878, 30, 1630