PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/25-14:28:00
G01     49.3           24.6                9.1 +/-    1.72      18.0 +/-    1.72  0.040 / 0.050
G06     177.8          25.9               10.8 +/-    1.66      20.7 +/-    1.66  0.060 / 0.060
G11     43.9           12.0                6.1 +/-    4.11      16.4 +/-    4.11  0.030 / 0.050
G13     251.8          29.8               10.8 +/-    1.38      18.9 +/-    1.38  0.030 / 0.040
G15     285.0          15.3                7.8 +/-    1.20      19.2 +/-    1.20  0.020 / 0.020
G17     333.3          78.0                9.4 +/-    0.30       9.6 +/-    0.30  0.020 / 0.020
G19     250.2          62.9                9.9 +/-    0.65      11.0 +/-    0.65  0.090 / 0.110
G28     54.4           52.3                8.8 +/-    0.50      10.8 +/-    0.50  0.090 / 0.080
G30     150.2          42.3                9.6 +/-    0.96      13.5 +/-    0.96  0.110 / 0.180