PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-02:57:30
G07     352.4          63.8                1.4 +/-    0.92       1.6 +/-    0.92  0.060 / 0.110
G08     79.5           52.1                3.9 +/-    0.46       4.8 +/-    0.46  0.050 / 0.120
G09     183.5          62.2                5.1 +/-    1.15       5.7 +/-    1.15  0.040 / 0.040
G11     138.9          19.7                6.2 +/-    1.74      13.7 +/-    1.74  0.030 / 0.040
G23     158.7          30.9                6.3 +/-    1.03      10.8 +/-    1.03  0.030 / 0.050
G27     45.6           24.1                1.4 +/-    1.27       2.9 +/-    1.27  0.030 / 0.050
G28     247.6          38.7                3.8 +/-    1.61       5.7 +/-    1.61  0.030 / 0.040
G30     312.3          44.1                1.5 +/-    0.82       2.1 +/-    0.82  0.040 / 0.030