PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-15:57:30
G02     201.9          23.5               14.3 +/-    0.85      29.0 +/-    0.85  0.060 / 0.100
G06     168.3          59.7               11.7 +/-    0.66      13.4 +/-    0.66  0.060 / 0.110
G13     225.2          9.8                13.0 +/-    2.74      36.5 +/-    2.74  0.110 / 0.470
G17     30.9           53.5                8.9 +/-    1.10      10.8 +/-    1.10  0.200 / 0.490
G19     346.7          69.1                9.4 +/-    0.68      10.0 +/-    0.68  0.110 / 0.290
G24     307.6          31.9                7.5 +/-    0.89      12.6 +/-    0.89  0.170 / 0.300
G28     94.3           36.3                9.6 +/-    0.62      14.8 +/-    0.62  0.040 / 0.040
G30     158.2          11.4               14.7 +/-    2.50      39.9 +/-    2.50  0.040 / 0.050