PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-14:27:50
G10     254.3          29.0                5.5 +/-    2.70       9.8 +/-    2.70  0.120 / 0.340
G13     50.6           28.4                3.8 +/-    2.20       6.9 +/-    2.20  0.140 / 0.260
G15     75.8           55.1                5.8 +/-    0.64       6.8 +/-    0.64  0.130 / 0.100
G16     294.9          13.9                2.7 +/-    2.57       7.0 +/-    2.57  0.090 / 0.090
G18     278.8          60.4                5.1 +/-    1.40       5.7 +/-    1.40  0.060 / 0.050
G20     43.3           48.2                3.9 +/-    1.13       5.0 +/-    1.13  0.060 / 0.040
G21     348.0          66.2                3.9 +/-    0.60       4.2 +/-    0.60  0.090 / 0.410
G26     265.6          13.7                2.8 +/-    1.78       7.1 +/-    1.78  0.100 / 0.390
G29     164.2          41.6                5.2 +/-    0.66       7.4 +/-    0.66  0.070 / 0.260