PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-10:12:40
G02     62.8           29.1                4.4 +/-    1.17       7.8 +/-    1.17  0.030 / 0.030
G05     54.7           58.3                4.5 +/-    0.91       5.2 +/-    0.91  0.030 / 0.030
G12     185.8          31.4                6.0 +/-    1.45      10.3 +/-    1.45  0.190 / 0.310
G13     127.3          16.7                6.2 +/-    2.60      14.8 +/-    2.60  0.230 / 0.270
G15     161.2          14.7                4.5 +/-    1.60      11.2 +/-    1.60  0.110 / 0.090
G20     211.6          58.1                5.7 +/-    0.75       6.6 +/-    0.75  0.110 / 0.090
G21     274.4          21.6                3.8 +/-    2.60       8.1 +/-    2.60  0.040 / 0.040
G25     234.3          50.2                5.9 +/-    2.68       7.4 +/-    2.68  0.040 / 0.040
G29     332.1          59.2                4.7 +/-    0.55       5.3 +/-    0.55  0.080 / 0.060