PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/15-02:13:00
G01     59.2           30.2                4.0 +/-    1.76       7.0 +/-    1.76  0.040 / 0.050
G06     181.4          14.2                6.3 +/-    2.66      15.8 +/-    2.66  0.050 / 0.050
G07     142.7          21.7                6.3 +/-    2.17      13.4 +/-    2.17  0.020 / 0.030
G11     49.0           25.2                3.2 +/-    1.06       6.3 +/-    1.06  0.030 / 0.030
G13     262.4          34.7                5.6 +/-    2.08       8.9 +/-    2.08  0.050 / 0.070
G15     292.2          16.8                3.0 +/-    1.98       7.1 +/-    1.98  0.090 / 0.090
G17     259.8          75.6                5.4 +/-    0.58       5.6 +/-    0.58  0.080 / 0.130
G19     234.0          52.0                5.6 +/-    2.57       6.9 +/-    2.57  0.070 / 0.130
G28     38.3           56.0                5.5 +/-    1.60       6.4 +/-    1.60  0.220 / 0.230
G30     143.3          46.7                7.7 +/-    0.66      10.1 +/-    0.66  0.170 / 0.190