PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-13:27:40
G01     82.9           32.8                5.6 +/-    1.22       9.2 +/-    1.22  0.140 / 0.210
G07     130.5          37.5                7.8 +/-    0.75      11.8 +/-    0.75  0.260 / 0.230
G11     61.1           34.6                6.9 +/-    0.99      10.9 +/-    0.99  0.050 / 0.090
G13     289.9          36.2                8.0 +/-    1.56      12.5 +/-    1.56  0.050 / 0.100
G15     313.0          11.1               -0.1 +/-   13.12      -0.4 +/-   13.12  0.030 / 0.020
G17     219.5          62.1                7.7 +/-    1.34       8.6 +/-    1.34  0.030 / 0.020
G19     217.5          34.4                8.7 +/-    2.36      14.0 +/-    2.36  0.080 / 0.100
G28     1.0            61.0                4.8 +/-    0.71       5.4 +/-    0.71  0.090 / 0.090
G30     116.7          73.4                6.3 +/-    0.43       6.6 +/-    0.43  0.050 / 0.040