PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-11:28:00
G07     321.2          53.2                4.6 +/-    0.83       5.5 +/-    0.83  0.080 / 0.110
G08     111.4          48.5                6.8 +/-    0.62       8.7 +/-    0.62  0.120 / 0.130
G09     204.6          80.8                5.8 +/-    0.47       5.8 +/-    0.47  0.050 / 0.040
G16     44.6           11.7                3.2 +/-    2.64       8.5 +/-    2.64  0.040 / 0.050
G23     151.9          50.0                7.8 +/-    0.47       9.9 +/-    0.47  0.040 / 0.050
G27     64.3           35.4                4.9 +/-    0.93       7.7 +/-    0.93  0.050 / 0.050
G28     231.1          22.5                5.3 +/-    2.00      11.0 +/-    2.00  0.030 / 0.050
G30     294.7          28.7                4.8 +/-    2.04       8.7 +/-    2.04  0.030 / 0.040