PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/18-20:57:50
G07     357.9          65.2               17.1 +/-    0.68      18.6 +/-    0.68  0.140 / 0.150
G08     78.6           53.6               18.0 +/-    0.60      21.8 +/-    0.60  0.230 / 0.210
G09     182.8          58.5               19.2 +/-    0.43      22.2 +/-    0.43  0.050 / 0.040
G11     138.2          21.9               19.8 +/-    2.01      41.7 +/-    2.01  0.030 / 0.030
G23     158.2          24.0               21.2 +/-    2.17      42.4 +/-    2.17  0.040 / 0.090
G27     43.6           21.9               13.9 +/-    1.68      29.1 +/-    1.68  0.050 / 0.090
G28     251.3          41.1               19.0 +/-    1.99      27.2 +/-    1.99  0.090 / 0.170
G30     316.5          47.8               16.1 +/-    0.70      20.9 +/-    0.70  0.100 / 0.160