PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-17:27:50
G07     357.8          64.6                9.5 +/-    0.57      10.4 +/-    0.57  0.070 / 0.160
G08     85.3           52.1               11.4 +/-    0.62      14.0 +/-    0.62  0.080 / 0.170
G09     186.5          67.2                9.1 +/-    0.86       9.8 +/-    0.86  0.040 / 0.040
G11     139.9          18.7               11.4 +/-    1.46      25.9 +/-    1.46  0.040 / 0.050
G23     157.6          34.4               12.7 +/-    1.83      20.4 +/-    1.83  0.060 / 0.080
G27     50.2           28.9                8.6 +/-    1.05      15.4 +/-    1.05  0.070 / 0.090
G28     241.5          30.9               12.6 +/-    1.53      21.7 +/-    1.53  0.070 / 0.110
G30     308.7          41.4                8.5 +/-    1.31      12.1 +/-    1.31  0.070 / 0.120