PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-03:12:50
G01     320.8          10.9              -18.6 +/-   18.49     -50.8 +/-   18.49  0.140 / 0.410
G08     263.5          17.3                8.6 +/-    2.39      20.3 +/-    2.39  0.130 / 0.430
G10     63.7           58.3                5.7 +/-    0.42       6.6 +/-    0.42  0.140 / 0.380
G11     308.6          20.3                7.8 +/-    3.98      17.1 +/-    3.98  0.030 / 0.030
G14     275.5          68.8                6.5 +/-    0.80       7.0 +/-    0.80  0.030 / 0.040
G18     93.3           35.9                6.9 +/-    0.36      10.7 +/-    0.36  0.170 / 0.270
G21     154.4          12.9                6.3 +/-    5.32      16.4 +/-    5.32  0.200 / 0.320
G27     228.8          14.0                9.1 +/-    1.97      23.1 +/-    1.97  0.040 / 0.060
G31     178.5          31.9                7.3 +/-    1.83      12.2 +/-    1.83  0.040 / 0.050
G32     339.4          73.4                6.2 +/-    0.63       6.4 +/-    0.63  0.040 / 0.090