PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/19-12:28:10
G07     353.3          64.2                5.3 +/-    0.95       5.8 +/-    0.95  0.060 / 0.060
G08     77.0           51.6                5.0 +/-    0.45       6.2 +/-    0.45  0.080 / 0.060
G09     179.8          58.9                6.8 +/-    0.41       7.8 +/-    0.41  0.040 / 0.040
G11     137.1          21.2                5.4 +/-    1.35      11.5 +/-    1.35  0.040 / 0.030
G23     158.4          28.3                5.7 +/-    1.45      10.4 +/-    1.45  0.120 / 0.180
G27     45.6           24.5                5.1 +/-    2.05      10.1 +/-    2.05  0.060 / 0.280
G28     248.0          38.6                5.6 +/-    1.27       8.3 +/-    1.27  0.070 / 0.110
G30     311.1          42.6                5.4 +/-    0.97       7.6 +/-    0.97  0.070 / 0.120