PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/06/30-16:58:00
G01     58.5           30.0                8.5 +/-    0.39      14.9 +/-    0.39  0.050 / 0.150
G07     143.0          21.0               11.7 +/-    0.81      25.0 +/-    0.81  0.060 / 0.140
G11     47.5           22.4                8.2 +/-    1.75      17.1 +/-    1.75  0.040 / 0.060
G13     260.6          34.7               10.4 +/-    1.83      16.6 +/-    1.83  0.040 / 0.050
G15     294.2          15.6                6.8 +/-    3.30      16.7 +/-    3.30  0.070 / 0.110
G17     263.3          76.4                9.3 +/-    0.71       9.5 +/-    0.71  0.060 / 0.110
G18     41.3           11.8                8.2 +/-    2.56      22.0 +/-    2.56  0.070 / 0.140
G19     233.8          49.5               11.3 +/-    0.70      14.3 +/-    0.70  0.080 / 0.150
G28     38.3           56.2                8.6 +/-    0.84      10.2 +/-    0.84  0.070 / 0.200
G30     144.9          51.1               11.3 +/-    0.96      14.1 +/-    0.96  0.080 / 0.210