PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-08:58:00
G02     31.3           57.4                4.3 +/-    0.97       5.0 +/-    0.97  0.030 / 0.030
G05     145.1          58.3                7.1 +/-    0.42       8.2 +/-    0.42  0.030 / 0.030
G06     50.3           22.9                2.7 +/-    1.91       5.6 +/-    1.91  0.030 / 0.030
G12     213.3          73.5                5.3 +/-    0.76       5.5 +/-    0.76  0.030 / 0.030
G19     96.7           12.0                6.5 +/-    2.34      17.4 +/-    2.34  0.230 / 0.660
G20     199.8          18.2                3.5 +/-    2.52       8.0 +/-    2.52  0.190 / 0.370
G25     303.5          49.8                3.2 +/-    4.01       4.0 +/-    4.01  0.170 / 0.130
G29     305.2          26.7                3.6 +/-    0.87       6.8 +/-    0.87  0.130 / 0.220