PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/21-08:57:30
G10     254.9          29.8                7.1 +/-    2.96      12.4 +/-    2.96  0.080 / 0.300
G13     49.7           27.5                2.0 +/-    2.36       3.8 +/-    2.36  0.090 / 0.330
G15     75.0           55.1                6.3 +/-    0.76       7.5 +/-    0.76  0.040 / 0.050
G16     291.2          14.7                1.6 +/-    2.02       4.1 +/-    2.02  0.030 / 0.040
G20     34.2           57.1                4.3 +/-    0.80       5.0 +/-    0.80  0.060 / 0.030
G21     342.1          64.4                4.5 +/-    0.25       5.0 +/-    0.25  0.040 / 0.030
G26     262.6          13.5                4.2 +/-    1.62      10.9 +/-    1.62  0.080 / 0.150
G29     165.8          43.7                8.2 +/-    0.70      11.3 +/-    0.70  0.090 / 0.170