PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-13:12:40
G01     39.7           13.7                4.6 +/-    3.32      11.8 +/-    3.32  0.110 / 0.310
G06     175.2          41.9                7.2 +/-    0.89      10.2 +/-    0.89  0.120 / 0.370
G13     236.9          20.0                4.0 +/-    2.32       8.8 +/-    2.32  0.060 / 0.130
G15     269.2          11.3                3.7 +/-    1.43      10.0 +/-    1.43  0.080 / 0.110
G17     13.0           66.1                4.1 +/-    0.59       4.4 +/-    0.59  0.180 / 0.300
G19     293.6          71.7                4.6 +/-    0.62       4.8 +/-    0.62  0.200 / 0.160
G24     316.2          20.4                4.3 +/-    2.50       9.3 +/-    2.50  0.020 / 0.030
G28     76.5           44.8                5.5 +/-    1.25       7.4 +/-    1.25  0.040 / 0.020
G30     155.6          25.5                6.1 +/-    2.11      11.9 +/-    2.11  0.210 / 0.240