PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-01:12:50
G08     316.1          15.2                7.4 +/-    3.57      18.3 +/-    3.57  0.040 / 0.040
G10     312.2          55.8                8.3 +/-    1.72       9.8 +/-    1.72  0.040 / 0.030
G14     213.4          23.0               12.9 +/-    2.47      26.4 +/-    2.47  0.070 / 0.100
G15     45.6           20.7                8.2 +/-    1.86      17.7 +/-    1.86  0.070 / 0.090
G18     18.2           63.7                8.5 +/-    0.80       9.4 +/-    0.80  0.040 / 0.080
G20     79.1           10.6                8.5 +/-    1.64      23.3 +/-    1.64  0.080 / 0.060
G21     120.8          65.9               10.8 +/-    0.63      11.7 +/-    0.63  0.300 / 0.310
G24     87.5           29.7               10.8 +/-    1.68      19.1 +/-    1.68  0.190 / 0.270
G27     286.2          37.9                6.5 +/-    1.24       9.8 +/-    1.24  0.070 / 0.060
G32     216.3          40.6               10.0 +/-    0.93      14.3 +/-    0.93  0.080 / 0.060