PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/18-19:57:50
G02     58.7           34.4                8.0 +/-    1.32      12.8 +/-    1.32  0.030 / 0.040
G05     57.7           61.2                9.9 +/-    0.72      11.2 +/-    0.72  0.030 / 0.050
G12     181.3          28.5               14.4 +/-    1.98      26.0 +/-    1.98  0.130 / 0.410
G13     127.3          15.6               16.5 +/-    4.17      40.5 +/-    4.17  0.110 / 0.380
G15     166.1          11.1                6.4 +/-   37.32      17.4 +/-   37.32  0.110 / 0.120
G21     271.4          16.7               14.7 +/-    3.74      35.2 +/-    3.74  0.050 / 0.120
G25     234.3          51.4                9.8 +/-    0.73      12.2 +/-    0.73  0.090 / 0.230
G29     327.7          53.8                7.3 +/-    0.79       8.8 +/-    0.79  0.070 / 0.210