PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-04:27:50
G10     243.0          19.6               12.0 +/-    3.00      26.6 +/-    3.00  0.100 / 0.290
G13     63.7           34.5                8.8 +/-    1.33      14.1 +/-    1.33  0.090 / 0.340
G15     106.3          57.0               10.8 +/-    0.49      12.6 +/-    0.49  0.060 / 0.060
G16     304.4          15.2                3.9 +/-    1.88       9.8 +/-    1.88  0.030 / 0.050
G20     274.3          63.0                8.0 +/-    0.57       8.8 +/-    0.57  0.080 / 0.090
G21     322.5          53.3                7.3 +/-    0.44       8.9 +/-    0.44  0.070 / 0.100
G26     275.8          19.0                6.9 +/-    0.85      15.6 +/-    0.85  0.030 / 0.030
G29     161.9          61.5               10.3 +/-    0.55      11.6 +/-    0.55  0.040 / 0.040