benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 shw1 Showers_No_1_1961_USC, 1993-08-18,  JMS ,  USGS ,  ASHTECH LM-XII3,  107,  7A26,  ASH700228D,  *031,  NONE, 1.2422, 1.2911, 30, 211030
 shw1 Showers_No_1_1961_US, 1992-05-08,  JMS ,  USGS ,  ASHTECH,  762 ,  LM-XII3 6A,  ASH700228A,  0745,  NONE, 1.3388, 1.3867, 30, 22930
 shw1 Showers_No_1_1961_US, 1994-09-16,  GDH ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.3529, 1.4007, 30, 16210
 shw1 Showers_No_1_1961_US, 2001-07-16,  JLS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.17, 1.2197, 30, 10
 shw1 Showers_No_1_1961_US, 2001-07-17,  JLS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.17, 1.2197, 30, 10
 shw1 Showers_No_1_1961_US, 2004-07-23,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 0.5479, 0.6128, 30, 30
 shw1 Showers_No_1_1961_US, 2004-07-24,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 0.5479, 0.6128, 30, 30
 shw1 Showers_No_1_1961_US, 2004-07-25,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 0.5479, 0.6128, 30, 30