benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 0221 Unknown, 1994-04-29,  Steve Holdorff ,  National Geodetic Su,  TRIMBLE 4000,  1552,  SSE,  TRM14532.00,  19,  NONE, 2.22, 0, 15, 162630
 0221 0221_1990_CalTrans, 2004-07-19,  CHS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031622,  NONE, 1.3914, 1.4389, 30, 1600
 0221 0221_1990_CalTrans, 2004-07-21,  JLS ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE00,  ASH701945B_M,  CR519993703,  NONE, 1.2814, 1.3299, 30, 16830