PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-07:57:40
G02     59.9           31.5                4.9 +/-    1.25       8.3 +/-    1.25  0.030 / 0.030
G05     58.8           60.8                5.4 +/-    0.62       6.1 +/-    0.62  0.030 / 0.030
G12     186.4          35.0                6.8 +/-    1.32      10.8 +/-    1.32  0.080 / 0.090
G13     129.9          14.3                7.0 +/-    2.03      17.7 +/-    2.03  0.070 / 0.100
G15     163.2          11.8                4.1 +/-    7.57      11.1 +/-    7.57  0.100 / 0.190
G20     210.1          52.6                7.1 +/-    0.66       8.6 +/-    0.66  0.190 / 0.230
G21     270.9          18.2                5.7 +/-    1.68      13.1 +/-    1.68  0.030 / 0.050
G25     240.1          52.7                6.5 +/-    2.97       7.9 +/-    2.97  0.050 / 0.050
G29     328.5          54.6                4.4 +/-    0.62       5.2 +/-    0.62  0.080 / 0.090