PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-16:27:30
G10     297.4          51.5                5.9 +/-    2.74       7.3 +/-    2.74  0.070 / 0.070
G14     210.5          12.3                3.6 +/-   15.65       9.5 +/-   15.65  0.100 / 0.070
G15     45.8           26.4                4.3 +/-    2.28       8.1 +/-    2.28  0.060 / 0.140
G18     4.3            65.6                6.1 +/-    0.42       6.6 +/-    0.42  0.060 / 0.130
G20     70.7           20.3                5.3 +/-    1.42      11.7 +/-    1.42  0.080 / 0.180
G21     105.7          68.9                8.1 +/-    0.91       8.6 +/-    0.91  0.080 / 0.220
G24     98.3           26.7                6.3 +/-    1.41      11.9 +/-    1.41  0.130 / 0.190
G27     298.6          35.2                6.4 +/-    0.95      10.1 +/-    0.95  0.180 / 0.180
G32     211.2          31.8                8.2 +/-    1.56      13.8 +/-    1.56  0.130 / 0.390