PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-14:13:10
G05     48.6           17.6                2.4 +/-    0.55       5.6 +/-    0.55  0.070 / 0.140
G10     235.8          11.1               -6.0 +/-   30.46     -16.3 +/-   30.46  0.080 / 0.130
G13     78.1           37.2                5.6 +/-    0.61       8.5 +/-    0.61  0.040 / 0.060
G15     122.7          51.9                7.4 +/-    0.88       9.1 +/-    0.88  0.030 / 0.060
G18     245.6          43.6                7.1 +/-    1.03       9.7 +/-    1.03  0.100 / 0.260
G20     21.7           70.0                4.3 +/-    0.69       4.6 +/-    0.69  0.100 / 0.260
G21     316.8          50.7                4.3 +/-    1.07       5.4 +/-    1.07  0.050 / 0.040
G25     199.8          11.2                6.0 +/-    1.60      16.4 +/-    1.60  0.040 / 0.040
G26     290.4          19.8                5.2 +/-    2.23      11.5 +/-    2.23  0.040 / 0.100
G29     152.5          68.9                6.6 +/-    0.53       7.0 +/-    0.53  0.050 / 0.110