PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/22-14:57:20
G02     216.2          59.6                8.4 +/-    0.95       9.6 +/-    0.95  0.080 / 0.070
G06     58.5           75.3                7.6 +/-    0.66       7.8 +/-    0.66  0.050 / 0.070
G12     318.8          36.2                7.2 +/-    1.08      11.1 +/-    1.08  0.060 / 0.070
G17     59.7           29.8                7.2 +/-    2.23      12.6 +/-    2.23  0.050 / 0.070
G19     42.5           47.3                6.4 +/-    0.62       8.3 +/-    0.62  0.030 / 0.020
G24     267.1          41.3                8.2 +/-    1.20      11.7 +/-    1.20  0.030 / 0.020
G28     123.5          12.6                9.9 +/-    2.18      26.0 +/-    2.18  0.040 / 0.100