benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 twis, 1994-11-03,  C. MILLS ,  UCLA ,  TRIMBLE 4000,  1054,  SST,  TRM14532.00,  25,  NONE, 0.8231, 0, 30, 172230
 twis, 1994-11-04,  C. MILLS ,  UCLA ,  TRIMBLE 4000,  1054,  SST,  TRM14532.00,  25,  NONE, 0.8249, 0, 30, 130
 twis Twissel_1959_CADWR, 2010-04-28,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 0.6637, 0.7238, 15, 0
 twis Twissel_1959_CADWR, 2010-04-29,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 0.6637, 0.7238, 15, 0
 twis Twissel_1959_CADWR, 2010-04-30,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 0.6637, 0.7238, 15, 0
 twis Twissel_1959_CADWR, 2012-06-08,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2012-06-09,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2012-06-10,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2012-06-11,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2012-06-12,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2012-06-13,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4197, 1.4669, 15, 0
 twis Twissel_1959_CADWR, 2013-06-25,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.8018, 0.8579, 15, 172945
 twis Twissel_1959_CADWR, 2013-06-26,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.8018, 0.8579, 15, 0
 twis Twissel_1959_CADWR, 2013-06-27,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.8018, 0.8579, 15, 0
 twis Twissel_1959_CADWR, 2015-04-09,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7771, 0.8339, 15, 0
 twis Twissel_1959_CADWR, 2015-04-10,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7771, 0.8339, 15, 0
 twis Twissel_1959_CADWR, 2015-04-11,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7771, 0.8339, 15, 0
 twis Twissel_1959_CADWR, 2015-04-12,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7771, 0.8339, 15, 0