PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-12:13:10
G10     287.1          47.7                4.7 +/-    3.32       6.1 +/-    3.32  0.080 / 0.090
G15     47.4           33.0                5.2 +/-    1.47       8.6 +/-    1.47  0.060 / 0.070
G20     64.1           27.7                5.0 +/-    2.27       9.2 +/-    2.27  0.080 / 0.150
G21     76.5           75.6                7.1 +/-    1.14       7.3 +/-    1.14  0.050 / 0.130
G24     105.6          23.5                5.4 +/-    0.78      11.0 +/-    0.78  0.040 / 0.030
G27     306.5          31.4                5.4 +/-    1.49       9.2 +/-    1.49  0.040 / 0.030
G29     167.9          12.7                4.3 +/-    0.62      11.3 +/-    0.62  0.090 / 0.120
G32     208.0          25.8                4.7 +/-    1.31       9.1 +/-    1.31  0.090 / 0.120