PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-14:42:40
G10     246.1          22.1                5.5 +/-    1.46      11.6 +/-    1.46  0.040 / 0.050
G13     59.9           33.6                5.0 +/-    0.89       8.1 +/-    0.89  0.040 / 0.050
G15     95.0           57.0                6.5 +/-    0.58       7.5 +/-    0.58  0.030 / 0.050
G16     304.8          13.6                2.4 +/-    1.94       6.2 +/-    1.94  0.030 / 0.050
G18     263.0          54.4                8.4 +/-    0.84      10.1 +/-    0.84  0.110 / 0.320
G20     36.0           56.3                4.5 +/-    0.49       5.3 +/-    0.49  0.120 / 0.280
G21     334.0          60.2                6.0 +/-    0.72       6.8 +/-    0.72  0.120 / 0.320
G26     275.3          17.2                3.6 +/-    1.35       8.4 +/-    1.35  0.110 / 0.330
G29     161.0          52.1                7.7 +/-    0.95       9.5 +/-    0.95  0.040 / 0.120