PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-03:27:40
G01     319.4          16.5                5.4 +/-    2.94      13.0 +/-    2.94  0.130 / 0.230
G08     257.4          14.1                5.5 +/-    2.54      14.0 +/-    2.54  0.130 / 0.280
G10     75.6           55.2                6.7 +/-    0.52       8.0 +/-    0.52  0.030 / 0.020
G11     303.2          24.0                6.9 +/-    1.27      13.8 +/-    1.27  0.020 / 0.020
G14     295.8          71.1                5.3 +/-    0.51       5.5 +/-    0.51  0.040 / 0.040
G18     99.6           31.4                5.5 +/-    1.03       9.4 +/-    1.03  0.030 / 0.040
G31     177.2          39.2                7.2 +/-    0.80      10.6 +/-    0.80  0.130 / 0.280
G32     358.7          69.6                5.9 +/-    0.27       6.3 +/-    0.27  0.170 / 0.370