PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-05:27:50
G01     84.1           32.8                5.8 +/-    1.56       9.7 +/-    1.56  0.040 / 0.040
G07     129.8          40.6                7.4 +/-    0.43      10.6 +/-    0.43  0.030 / 0.050
G11     64.0           37.6                5.8 +/-    0.40       8.8 +/-    0.40  0.060 / 0.040
G13     290.0          36.5                6.2 +/-    1.83       9.6 +/-    1.83  0.060 / 0.040
G15     311.3          12.5                3.1 +/-    1.79       8.3 +/-    1.79  0.110 / 0.130
G17     218.9          59.5                7.0 +/-    1.40       8.0 +/-    1.40  0.090 / 0.190
G19     217.1          32.9                5.8 +/-    2.15       9.6 +/-    2.15  0.060 / 0.090
G28     0.5            61.1                4.3 +/-    0.56       4.9 +/-    0.56  0.070 / 0.100
G30     118.8          70.2                6.5 +/-    0.78       6.8 +/-    0.78  0.070 / 0.090