PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/31-02:28:00
G01     84.2           32.9                3.4 +/-    1.28       5.6 +/-    1.28  0.030 / 0.040
G07     129.8          41.2                5.0 +/-    0.79       7.2 +/-    0.79  0.040 / 0.040
G11     65.3           38.8                3.2 +/-    1.09       4.7 +/-    1.09  0.050 / 0.070
G13     289.6          36.7                4.4 +/-    1.67       6.8 +/-    1.67  0.070 / 0.090
G15     311.1          12.6                3.1 +/-    1.91       8.1 +/-    1.91  0.050 / 0.050
G17     219.0          57.8                5.9 +/-    1.04       6.8 +/-    1.04  0.050 / 0.050
G19     217.1          32.3                6.1 +/-    1.57      10.2 +/-    1.57  0.080 / 0.250
G28     0.4            61.1                2.5 +/-    0.41       2.8 +/-    0.41  0.160 / 0.290
G30     120.4          68.1                5.0 +/-    0.68       5.4 +/-    0.68  0.030 / 0.050