PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-18:42:30
G02     207.3612       39.0769         18.0363 +/-  1.8511   26.6368 +/-  1.8511  0.040 / 0.070
G06     134.7577       77.1427         14.7019 +/-  0.7128   15.0404 +/-  0.7128  0.030 / 0.060
G12     312.8286       23.6520         13.7074 +/-  2.4885   27.6335 +/-  2.4885  0.050 / 0.090
G17     46.1109        40.7620         14.1939 +/-  0.3923   20.3917 +/-  0.3923  0.050 / 0.100
G19     21.7432        58.3593         14.5940 +/-  0.5222   16.8212 +/-  0.5222  0.050 / 0.100
G24     289.7804       40.5721         13.0173 +/-  1.0013   18.7585 +/-  1.0013  0.060 / 0.100
G28     110.8107       25.1034         15.4580 +/-  1.5070   30.1324 +/-  1.5070  0.080 / 0.180