PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-17:27:50
G02     52.4           39.8                6.4 +/-    1.43       9.3 +/-    1.43  0.120 / 0.300
G05     73.4           68.3                7.0 +/-    0.68       7.5 +/-    0.68  0.130 / 0.340
G12     183.5          36.7                8.4 +/-    1.05      12.9 +/-    1.05  0.080 / 0.050
G13     132.3          11.2               10.1 +/-    2.68      27.4 +/-    2.68  0.080 / 0.070
G21     266.8          13.7                7.1 +/-    1.31      18.2 +/-    1.31  0.030 / 0.030
G25     242.1          55.4                7.7 +/-    1.86       9.2 +/-    1.86  0.030 / 0.030
G29     324.2          48.4                6.1 +/-    0.46       7.9 +/-    0.46  0.060 / 0.070