PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-19:12:50
G02     49.5           41.9                8.1 +/-    1.66      11.5 +/-    1.66  0.040 / 0.080
G05     80.9           68.6                7.8 +/-    0.43       8.3 +/-    0.43  0.050 / 0.070
G12     182.7          40.0               11.1 +/-    1.68      16.1 +/-    1.68  0.140 / 0.540
G21     262.9          9.9                -2.0 +/-   22.57      -5.7 +/-   22.57  0.110 / 0.510
G25     252.9          57.5               10.5 +/-    0.64      12.2 +/-    0.64  0.030 / 0.030
G29     320.8          43.8                8.3 +/-    1.29      11.4 +/-    1.29  0.030 / 0.030