PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-15:57:30
G10     296.5          51.2                6.6 +/-    2.49       8.3 +/-    2.49  0.110 / 0.070
G14     210.3          11.6               -1.5 +/-   22.61      -4.1 +/-   22.61  0.050 / 0.060
G15     45.9           26.9                4.8 +/-    2.03       9.1 +/-    2.03  0.080 / 0.250
G18     3.3            65.7                7.0 +/-    0.42       7.6 +/-    0.42  0.110 / 0.240
G20     70.2           20.9                6.7 +/-    1.82      14.4 +/-    1.82  0.090 / 0.110
G21     103.7          69.7                8.2 +/-    0.78       8.7 +/-    0.78  0.060 / 0.110
G24     98.9           26.5                8.1 +/-    1.17      15.3 +/-    1.17  0.140 / 0.400
G27     299.3          34.9                6.9 +/-    1.36      10.9 +/-    1.36  0.100 / 0.420
G32     210.9          31.4                8.3 +/-    1.51      14.2 +/-    1.51  0.170 / 0.160