PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/25-09:58:00
G02     60.4           31.1                4.5 +/-    0.63       7.6 +/-    0.63  0.020 / 0.030
G05     58.5           60.9                4.5 +/-    0.56       5.0 +/-    0.56  0.020 / 0.030
G12     186.5          34.6                6.4 +/-    1.38      10.2 +/-    1.38  0.060 / 0.070
G13     129.6          14.7                6.6 +/-    2.24      16.5 +/-    2.24  0.040 / 0.110
G15     162.8          12.3                4.4 +/-    2.10      11.7 +/-    2.10  0.040 / 0.060
G20     209.8          54.7                6.9 +/-    1.28       8.2 +/-    1.28  0.030 / 0.050
G21     271.9          19.7                4.6 +/-    1.80      10.3 +/-    1.80  0.040 / 0.070
G25     238.7          52.3                5.6 +/-    1.13       6.9 +/-    1.13  0.050 / 0.050
G29     329.8          56.2                3.5 +/-    0.94       4.1 +/-    0.94  0.160 / 0.230