PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-13:57:40
G02     262.1          78.5                4.1 +/-    0.37       4.2 +/-    0.37  0.080 / 0.110
G05     171.1          19.9                5.3 +/-    1.14      11.7 +/-    1.14  0.110 / 0.130
G06     39.7           51.2                3.4 +/-    0.80       4.2 +/-    0.80  0.080 / 0.110
G12     321.0          59.0                3.4 +/-    1.05       3.8 +/-    1.05  0.060 / 0.140
G17     74.4           20.3                4.1 +/-    1.72       9.0 +/-    1.72  0.060 / 0.090
G19     63.8           33.1                4.1 +/-    1.58       6.8 +/-    1.58  0.060 / 0.080
G24     240.6          31.1                4.0 +/-    1.47       6.8 +/-    1.47  0.030 / 0.030
G25     317.1          16.5                4.7 +/-    2.30      11.3 +/-    2.30  0.030 / 0.030