PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-04:27:50
G01     90.2           31.8                5.4 +/-    0.91       9.2 +/-    0.91  0.070 / 0.080
G07     125.4          45.3                6.2 +/-    0.69       8.3 +/-    0.69  0.060 / 0.080
G11     70.0           40.1                4.7 +/-    1.35       6.8 +/-    1.35  0.040 / 0.090
G13     295.9          35.2                6.2 +/-    5.51       9.9 +/-    5.51  0.040 / 0.070
G15     315.0          10.5               -8.2 +/-    6.60     -22.6 +/-    6.60  0.090 / 0.190
G17     214.6          54.0                7.6 +/-    1.18       9.2 +/-    1.18  0.160 / 0.250
G19     214.5          28.0                7.0 +/-    1.10      12.8 +/-    1.10  0.040 / 0.040
G28     350.6          61.6                3.9 +/-    0.48       4.4 +/-    0.48  0.040 / 0.040
G30     107.0          73.8                5.7 +/-    0.55       5.9 +/-    0.55  0.080 / 0.090