PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-17:12:30
G07     12.9           66.6                9.2 +/-    0.91      10.0 +/-    0.91  0.060 / 0.060
G08     75.0           51.2                9.0 +/-    1.16      11.2 +/-    1.16  0.050 / 0.060
G09     183.2          60.3               10.7 +/-    0.75      12.1 +/-    0.75  0.040 / 0.040
G11     135.5          22.9                9.2 +/-    1.35      18.9 +/-    1.35  0.040 / 0.050
G23     158.9          27.7                9.3 +/-    2.20      17.1 +/-    2.20  0.120 / 0.130
G27     45.6           24.7                8.4 +/-    1.59      16.6 +/-    1.59  0.130 / 0.110
G28     247.0          35.5               11.6 +/-    1.76      18.2 +/-    1.76  0.090 / 0.120
G30     314.2          46.1                9.5 +/-    1.07      12.7 +/-    1.07  0.070 / 0.140