PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-02:27:50
G01     320.0          15.2               -3.0 +/-   35.52      -7.4 +/-   35.52  0.200 / 0.260
G08     258.6          14.8               11.8 +/-    2.48      29.5 +/-    2.48  0.230 / 0.360
G10     74.8           54.7               10.3 +/-    0.53      12.4 +/-    0.53  0.170 / 0.300
G11     305.1          22.2               11.5 +/-    1.63      23.9 +/-    1.63  0.160 / 0.230
G14     284.7          69.1               10.6 +/-    0.70      11.3 +/-    0.70  0.030 / 0.040
G18     307.3          38.2                9.3 +/-    1.73      14.0 +/-    1.73  0.040 / 0.040
G20     75.3           63.6               11.6 +/-    1.21      12.7 +/-    1.21  0.150 / 0.230
G27     226.5          10.9               12.1 +/-    3.67      33.0 +/-    3.67  0.100 / 0.210
G31     174.8          40.3               10.3 +/-    1.25      14.9 +/-    1.25  0.160 / 0.290
G32     5.7            68.6                9.7 +/-    0.45      10.3 +/-    0.45  0.160 / 0.340