PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-06:13:00
G01     59.8           30.4                5.0 +/-    1.64       8.7 +/-    1.64  0.030 / 0.050
G06     183.5          11.4               -5.9 +/-   30.45     -16.1 +/-   30.45  0.030 / 0.040
G07     142.4          21.6                7.9 +/-    1.43      16.7 +/-    1.43  0.030 / 0.020
G11     48.5           23.8                3.5 +/-    1.89       7.0 +/-    1.89  0.030 / 0.020
G13     263.7          34.9                6.0 +/-    1.96       9.6 +/-    1.96  0.090 / 0.170
G15     293.0          16.8                3.0 +/-    1.65       7.1 +/-    1.65  0.120 / 0.180
G17     263.3          77.3                6.4 +/-    0.27       6.6 +/-    0.27  0.060 / 0.080
G19     233.5          52.3                5.9 +/-    2.20       7.2 +/-    2.20  0.060 / 0.090
G28     37.4           56.2                7.3 +/-    0.61       8.6 +/-    0.61  0.130 / 0.210
G30     143.3          50.2                8.7 +/-    0.71      11.0 +/-    0.71  0.140 / 0.270