PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:28:10
G01     57.1           29.1                7.7 +/-    1.42      13.7 +/-    1.42  0.060 / 0.180
G06     179.7          17.5               12.5 +/-    1.37      29.2 +/-    1.37  0.100 / 0.170
G07     143.1          17.0               10.0 +/-    1.72      23.7 +/-    1.72  0.080 / 0.160
G11     46.4           19.0                7.3 +/-    1.37      16.5 +/-    1.37  0.070 / 0.140
G13     261.7          33.9                7.6 +/-    1.23      12.3 +/-    1.23  0.040 / 0.050
G15     293.7          15.8                4.1 +/-    1.45      10.1 +/-    1.45  0.030 / 0.040
G17     282.8          79.7                8.4 +/-    0.76       8.5 +/-    0.76  0.050 / 0.100
G19     236.6          55.4                8.2 +/-    0.82       9.8 +/-    0.82  0.050 / 0.090
G28     40.7           55.6                8.0 +/-    0.69       9.5 +/-    0.69  0.030 / 0.030
G30     145.3          51.5                9.7 +/-    1.25      12.0 +/-    1.25  0.030 / 0.030