PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-16:57:40
G02     248.1          75.6                8.2 +/-    0.47       8.4 +/-    0.47  0.060 / 0.210
G05     171.0          18.7                9.9 +/-    1.63      22.5 +/-    1.63  0.070 / 0.210
G06     40.5           52.6                8.4 +/-    0.42      10.3 +/-    0.42  0.080 / 0.130
G12     322.7          60.6                7.2 +/-    1.39       8.1 +/-    1.39  0.080 / 0.110
G17     74.4           19.0                7.7 +/-    1.07      17.5 +/-    1.07  0.030 / 0.050
G19     57.7           39.5                8.5 +/-    0.83      12.5 +/-    0.83  0.030 / 0.050
G24     239.7          32.6               11.5 +/-    0.89      19.2 +/-    0.89  0.040 / 0.050
G25     317.2          16.0                6.9 +/-    3.70      16.8 +/-    3.70  0.040 / 0.040