benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 dnl1 DNL1_1952, 2002-11-10,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3632, 1.4109, 30, 60
 dnl1 DNL1_1952, 2002-11-11,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3642, 1.4119, 30, 10
 dnl1 DNL1_1952, 2002-11-12,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 30, 10
 dnl1 DNL1_1952, 2002-11-13,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 30, 10
 dnl1 DNL1_1952, 2002-11-14,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 30, 10
 dnl1 DNL1_1952, 2002-11-15,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 30, 10
 dnl1 DNL1_1952, 2002-11-16,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 30, 10
 dnl1 DNL1_1952, 2002-11-17,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 15, 45
 dnl1 DNL1_1952, 2002-11-18,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3662, 1.4139, 15, 45
 dnl1 DNL1_1952, 2002-11-19,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3672, 1.4149, 15, 45
 dnl1 DNL1_1952, 2002-11-20,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3672, 1.4149, 15, 45
 dnl1 DNL1_1952, 2002-11-21,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-22,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-23,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-24,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-25,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-26,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-27,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-28,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-29,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-11-30,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-01,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-02,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-03,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-04,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-05,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-06,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2002-12-07,  JMS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.3682, 1.4159, 15, 45
 dnl1 DNL1_1952, 2003-05-14,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-15,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-16,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-17,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-18,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-19,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 1.2764, 1.3249, 15, 45
 dnl1 DNL1_1952, 2003-05-21,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.3814, 1.4289, 15, 14245
 dnl1 DNL1_1952, 2003-05-22,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.3814, 1.4289, 15, 45
 dnl1 DNL1_1952, 2003-09-26,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-09-27,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-09-28,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-09-29,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-09-30,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-10-01,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_1952, 2003-10-02,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE00,  ASH700936D_M,  CR14244,  NONE, 1.2986, 1.3469, 15, 0
 dnl1 DNL1_stmpd_Y63_1952_, 2004-06-17,  JLS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.462, 1.5089, 15, 15
 dnl1 DNL1_stmpd_Y63_1952_, 2004-06-18,  JLS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.462, 1.5089, 15, 15
 dnl1 DNL1_stmpd_Y63_1952_, 2004-06-19,  JLS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.462, 1.5089, 15, 15
 dnl1 DNL1_stmpd_Y63_1952_, 2004-06-20,  JLS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.462, 1.5089, 15, 15
 dnl1 DNL1_stmpd_Y63_1952_, 2004-06-21,  JLS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.462, 1.5089, 15, 15