PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-11:27:50
G01     117.8          18.7                4.3 +/-    1.00       9.7 +/-    1.00  0.030 / 0.030
G07     84.4           65.7                5.2 +/-    0.49       5.6 +/-    0.49  0.020 / 0.030
G08     43.8           28.2                2.7 +/-    0.82       4.9 +/-    0.82  0.020 / 0.030
G09     175.0          22.3                4.7 +/-    0.68       9.9 +/-    0.68  0.030 / 0.040
G11     103.1          40.4                5.8 +/-    1.04       8.4 +/-    1.04  0.140 / 0.190
G13     316.9          20.8                0.7 +/-    2.85       1.4 +/-    2.85  0.110 / 0.210
G17     201.4          27.5                5.2 +/-    1.80       9.7 +/-    1.80  0.080 / 0.370
G18     92.1           21.3                4.0 +/-    0.91       8.5 +/-    0.91  0.100 / 0.280
G28     294.8          57.8                3.5 +/-    1.11       4.0 +/-    1.11  0.100 / 0.190
G30     345.3          68.6                3.4 +/-    0.72       3.6 +/-    0.72  0.110 / 0.200