PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/28-11:42:50
G01     60.3           30.4                2.8 +/-    1.64       4.8 +/-    1.64  0.180 / 0.130
G06     181.1          13.9                6.6 +/-    2.73      17.0 +/-    2.73  0.080 / 0.110
G07     142.0          20.6                4.5 +/-    1.11       9.8 +/-    1.11  0.040 / 0.110
G11     47.9           22.2                1.6 +/-    1.80       3.3 +/-    1.80  0.130 / 0.150
G13     265.3          34.9                7.5 +/-    2.31      11.9 +/-    2.31  0.040 / 0.030
G15     295.2          16.2                4.0 +/-    1.59       9.6 +/-    1.59  0.030 / 0.030
G17     265.7          78.4                5.9 +/-    0.46       6.0 +/-    0.46  0.190 / 0.330
G19     233.0          52.5                7.5 +/-    2.53       9.2 +/-    2.53  0.180 / 0.300
G28     36.2           56.5                4.7 +/-    1.43       5.5 +/-    1.43  0.030 / 0.020
G30     143.2          53.7                6.2 +/-    0.55       7.5 +/-    0.55  0.040 / 0.030