PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-02:58:10
G07     357.1          64.8                3.5 +/-    1.14       3.9 +/-    1.14  0.050 / 0.130
G08     75.6           51.5                3.8 +/-    0.67       4.8 +/-    0.67  0.050 / 0.080
G09     182.6          59.6                6.9 +/-    0.31       7.8 +/-    0.31  0.030 / 0.030
G11     137.2          21.2                6.2 +/-    1.20      13.3 +/-    1.20  0.030 / 0.030
G23     159.1          28.5                8.1 +/-    1.85      14.6 +/-    1.85  0.040 / 0.040
G27     44.2           22.5                2.5 +/-    2.48       5.2 +/-    2.48  0.050 / 0.030
G28     250.0          40.4                3.8 +/-    1.63       5.4 +/-    1.63  0.090 / 0.140
G30     314.4          45.8                3.0 +/-    0.88       4.0 +/-    0.88  0.100 / 0.120