PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/27-15:58:00
G07     312.8          51.3                8.6 +/-    0.92      10.7 +/-    0.92  0.030 / 0.070
G08     127.7          40.3               11.0 +/-    0.68      15.9 +/-    0.68  0.040 / 0.070
G09     306.8          76.9                8.6 +/-    1.02       8.8 +/-    1.02  0.080 / 0.170
G16     42.0           27.6                5.5 +/-    1.79      10.1 +/-    1.79  0.120 / 0.170
G23     143.6          64.0                9.9 +/-    1.04      10.8 +/-    1.04  0.050 / 0.060
G27     82.1           37.7                8.0 +/-    0.62      12.0 +/-    0.62  0.050 / 0.090
G30     286.2          23.4                8.9 +/-    0.88      18.1 +/-    0.88  0.040 / 0.050