PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-02:27:30
G07     329.5          56.6                2.7 +/-    0.41       3.2 +/-    0.41  0.140 / 0.170
G08     103.4          51.0                5.4 +/-    0.43       6.7 +/-    0.43  0.120 / 0.120
G09     199.0          77.0                4.1 +/-    0.32       4.2 +/-    0.32  0.040 / 0.040
G11     148.0          10.9                2.7 +/-   16.44       7.5 +/-   16.44  0.040 / 0.040
G16     45.6           12.7                1.0 +/-    3.94       2.5 +/-    3.94  0.130 / 0.190
G23     154.7          45.3                7.0 +/-    0.96       9.3 +/-    0.96  0.090 / 0.170
G27     56.9           32.3                1.2 +/-    1.15       2.1 +/-    1.15  0.030 / 0.020
G28     235.5          28.1                3.6 +/-    1.93       6.6 +/-    1.93  0.030 / 0.010
G30     300.7          34.7                1.9 +/-    1.89       3.0 +/-    1.89  0.070 / 0.070