benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 alka Alka_8214_1991_CalTra, 1999-08-03,  UC BERKELEY ,   ,  TRIMBLE 4000SSE,  5699,  7.29,  TRM22020.00+GP,  18931,  NONE, 1.2828, 0, 30, 173230
 ALKA HPGN_0211, 1999-08-01,  UC BERKELEY ,   ,  TRIMBLE,  5699 ,  4000SSE 7.29,  TRM22020.00+GP,  18931,  NONE, 1.3193, 0, 30, 171930
 alka, 1999-09-15,  JJB ,  USGS ,  ASHTECH,  192 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 0.8016, 0.8577, 30, 15480
 alka, 1999-09-24,  JJB ,  USGS ,  ASHTECH,  192 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 0.7975, 0.8537, 30, 154830
 alka Alka_8214_1991_CalTr, 2003-06-18,  ETE ,  USGS CVO ,  ASHTECH,  LP019992604 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993302,  NONE, 1.4298, 1.4769, 30, 143230
 alka, 2003-07-03,  SAH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.458, 1.5049, 30, 154630
 alka Alka_8214_1991_CalTr, 2008-09-14,  JMS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH701945E_M,  CR620022605,  NONE, 0.735, 0.7929, 30, 15400
 alka Alka_8214_1991_CalTr, 2008-09-18,  SAH ,  USGS ,  ASHTECH,  579 ,  Z-XII 1L00,  ASH700936D_M,  CR14244,  NONE, 1.4892, 1.5359, 30, 15470
 alka Alka_8214_1991_CalTr, 2013-09-11,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993706,  NONE, 1.6343, 1.68, 15, 153215
 alka Alka_8214_1991_CalTr, 2013-09-12,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993706,  NONE, 1.6282, 1.6739, 15, 155515