PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-13:57:50
G01     114.5          20.9               10.0 +/-    1.29      21.5 +/-    1.29  0.030 / 0.040
G07     95.3           60.6               10.0 +/-    0.86      11.3 +/-    0.86  0.030 / 0.040
G08     43.0           25.5                7.0 +/-    0.64      13.4 +/-    0.64  0.090 / 0.150
G09     174.9          19.7                8.8 +/-    2.44      19.5 +/-    2.44  0.090 / 0.130
G11     97.1           39.7                9.7 +/-    0.83      14.1 +/-    0.83  0.040 / 0.040
G13     316.3          21.3                3.8 +/-    1.08       8.2 +/-    1.08  0.040 / 0.040
G17     202.3          31.9               10.2 +/-    1.67      17.1 +/-    1.67  0.070 / 0.110
G28     302.1          58.9                8.0 +/-    0.74       9.1 +/-    0.74  0.070 / 0.080
G30     350.7          70.6                7.9 +/-    0.94       8.3 +/-    0.94  0.080 / 0.320