PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/23-07:12:30
G07     18.1           67.9                3.2 +/-    0.56       3.4 +/-    0.56  0.060 / 0.060
G08     62.8           47.3                3.1 +/-    0.62       4.0 +/-    0.62  0.060 / 0.060
G09     179.0          49.8                7.5 +/-    2.13       9.5 +/-    2.13  0.050 / 0.090
G11     129.6          26.4                6.1 +/-    1.10      11.5 +/-    1.10  0.050 / 0.090
G23     160.6          21.7                7.3 +/-    1.43      15.3 +/-    1.43  0.030 / 0.040
G27     40.4           16.7                2.0 +/-    0.64       4.8 +/-    0.64  0.040 / 0.040
G28     258.8          45.6                6.5 +/-    1.23       8.7 +/-    1.23  0.040 / 0.060
G30     319.5          49.7                3.1 +/-    0.73       3.9 +/-    0.73  0.060 / 0.060