PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-17:28:10
G07     37.1           67.9                7.7 +/-    0.58       8.3 +/-    0.58  0.090 / 0.090
G08     61.7           47.2                8.8 +/-    1.06      11.4 +/-    1.06  0.100 / 0.120
G09     180.7          50.1               10.1 +/-    0.83      12.8 +/-    0.83  0.030 / 0.030
G11     128.3          29.0               10.6 +/-    3.06      18.9 +/-    3.06  0.030 / 0.030
G18     111.9          10.7                7.4 +/-   14.79      20.4 +/-   14.79  0.050 / 0.050
G23     160.1          18.5                9.1 +/-    2.79      20.7 +/-    2.79  0.030 / 0.060
G27     40.8           17.9                7.2 +/-    1.74      16.6 +/-    1.74  0.220 / 0.190
G28     256.5          42.0                9.9 +/-    2.45      13.9 +/-    2.45  0.130 / 0.190
G30     322.7          53.0                7.8 +/-    0.73       9.5 +/-    0.73  0.150 / 0.330