PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-02:43:10
G01     41.2           16.4                3.5 +/-    2.16       8.3 +/-    2.16  0.040 / 0.050
G06     176.7          37.5                6.9 +/-    1.99      10.5 +/-    1.99  0.050 / 0.060
G13     238.5          22.1                6.1 +/-    2.18      12.7 +/-    2.18  0.070 / 0.090
G15     270.2          12.5                4.3 +/-    1.38      11.5 +/-    1.38  0.070 / 0.070
G17     356.9          71.4                5.2 +/-    0.61       5.5 +/-    0.61  0.030 / 0.030
G19     278.5          69.3                4.8 +/-    0.53       5.1 +/-    0.53  0.020 / 0.030
G24     316.9          18.6                3.6 +/-    1.99       8.2 +/-    1.99  0.180 / 0.170
G28     72.3           46.4                3.7 +/-    1.19       5.0 +/-    1.19  0.180 / 0.130
G30     153.4          23.7                6.9 +/-    2.61      13.9 +/-    2.61  0.090 / 0.130