PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-15:13:10
G10     256.3          30.5                6.5 +/-    1.77      11.2 +/-    1.77  0.340 / 0.260
G13     48.8           27.0                4.3 +/-    1.94       8.0 +/-    1.94  0.320 / 0.420
G15     72.0           54.1                6.8 +/-    0.52       8.2 +/-    0.52  0.080 / 0.060
G16     293.2          13.5                2.8 +/-    2.20       7.1 +/-    2.20  0.080 / 0.060
G18     282.7          61.4                6.8 +/-    1.41       7.6 +/-    1.41  0.180 / 0.220
G20     45.3           45.9                4.7 +/-    0.71       6.3 +/-    0.71  0.120 / 0.260
G21     353.5          67.9                5.6 +/-    0.30       6.0 +/-    0.30  0.070 / 0.150
G26     264.0          12.7                5.1 +/-    1.33      13.4 +/-    1.33  0.090 / 0.160
G27     321.7          11.5               -8.3 +/-   22.27     -22.3 +/-   22.27  0.110 / 0.390
G29     164.5          38.6                9.1 +/-    0.88      13.5 +/-    0.88  0.100 / 0.370