benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 c253, 2001-09-12,  JMS ,   ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992805,  NONE, 1.4438, 1.4908, 30, 15430
 c253, 2001-09-19,  WRT ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 1.3964, 1.4438, 30, 16230
 c253 CC253_1944_USCGS, 2005-09-16,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3339, 1.3819, 30, 172730
 c253 CC253_1944_USCGS, 2005-09-17,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3339, 1.3819, 30, 0
 c253 CC253_1944_USCGS, 2005-09-20,  WRT ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.2056, 1.2549, 30, 16210
 c253 CC253_1944_USCGS, 2010-08-10,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4025, 1.4499, 15, 181315
 c253 CC253_1944_USCGS, 2010-08-11,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4025, 1.4499, 15, 0
 c253 CC253_1944_USCGS, 2010-08-12,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4025, 1.4499, 15, 0
 c253 CC253_1944_USCGS, 2010-08-13,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.4025, 1.4499, 15, 0