PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-16:12:40
G01     66.2           31.9                9.8 +/-    1.13      16.6 +/-    1.13  0.090 / 0.210
G06     181.4          10.3              -16.7 +/-   21.83     -46.2 +/-   21.83  0.090 / 0.290
G07     139.2          24.0                9.9 +/-    1.56      19.9 +/-    1.56  0.030 / 0.030
G11     50.2           25.1                8.0 +/-    1.61      15.5 +/-    1.61  0.030 / 0.030
G13     272.0          36.4               12.1 +/-    1.51      18.8 +/-    1.51  0.080 / 0.160
G15     302.8          14.4                8.2 +/-    2.62      20.7 +/-    2.62  0.070 / 0.170
G17     244.4          74.9               13.2 +/-    0.45      13.6 +/-    0.45  0.060 / 0.100
G19     227.5          47.6              -70.5 +/-   30.11     -91.7 +/-   30.11  0.050 / 0.110
G28     26.0           58.2                4.9 +/-    2.78       5.7 +/-    2.78  0.040 / 0.030
G30     138.3          60.8               11.7 +/-    0.26      13.2 +/-    0.26  0.030 / 0.030