PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/28-21:27:40
G07     27.8           68.2                7.2 +/-    0.91       7.7 +/-    0.91  0.030 / 0.040
G08     61.8           46.6                8.5 +/-    1.35      11.2 +/-    1.35  0.040 / 0.030
G09     180.0          50.5               11.4 +/-    0.90      14.3 +/-    0.90  0.120 / 0.210
G11     128.7          28.2               11.2 +/-    1.09      20.3 +/-    1.09  0.130 / 0.120
G18     111.5          10.2                0.4 +/-   27.65       1.1 +/-   27.65  0.090 / 0.150
G23     160.7          21.3               10.5 +/-    1.29      22.4 +/-    1.29  0.100 / 0.110
G27     41.6           19.4                6.3 +/-    2.23      14.0 +/-    2.23  0.060 / 0.050
G28     255.9          42.1               11.0 +/-    3.00      15.5 +/-    3.00  0.080 / 0.050
G30     319.8          50.4                7.6 +/-    0.96       9.6 +/-    0.96  0.220 / 0.420