PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-02:12:30
G07     317.9          51.7                3.3 +/-    1.07       4.1 +/-    1.07  0.070 / 0.270
G08     116.7          46.9                7.5 +/-    1.06       9.8 +/-    1.06  0.070 / 0.210
G09     247.3          82.8                2.1 +/-    0.76       2.1 +/-    0.76  0.030 / 0.050
G16     43.2           20.0                2.8 +/-    1.32       6.2 +/-    1.32  0.030 / 0.060
G23     150.6          54.8                6.3 +/-    0.56       7.5 +/-    0.56  0.050 / 0.060
G27     66.6           35.5                3.5 +/-    0.55       5.5 +/-    0.55  0.030 / 0.070
G28     229.4          20.9                4.4 +/-    1.71       9.6 +/-    1.71  0.070 / 0.180
G30     293.6          29.1                1.0 +/-    1.17       1.8 +/-    1.17  0.080 / 0.250