PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-00:57:50
G08     320.5          11.2               -1.6 +/-   30.50      -4.3 +/-   30.50  0.030 / 0.050
G10     301.5          52.7                8.7 +/-    0.99      10.6 +/-    0.99  0.030 / 0.040
G14     211.0          16.7               12.5 +/-    2.18      29.9 +/-    2.18  0.070 / 0.140
G15     45.8           26.7                7.9 +/-    0.96      14.9 +/-    0.96  0.070 / 0.130
G18     3.9            65.5                9.5 +/-    0.41      10.3 +/-    0.41  0.040 / 0.040
G20     74.3           14.8                7.1 +/-    2.17      17.8 +/-    2.17  0.040 / 0.040
G21     106.9          71.4               10.2 +/-    0.60      10.7 +/-    0.60  0.050 / 0.090
G24     95.3           27.8               10.5 +/-    0.92      19.2 +/-    0.92  0.060 / 0.090
G27     294.7          36.4                9.9 +/-    1.30      15.2 +/-    1.30  0.090 / 0.220
G32     212.7          33.9               12.5 +/-    2.31      20.2 +/-    2.31  0.090 / 0.320