PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-21:57:50
G10     243.9          20.9               12.4 +/-    1.55      26.8 +/-    1.55  0.050 / 0.050
G13     61.9           33.7                9.1 +/-    1.22      14.7 +/-    1.22  0.050 / 0.050
G15     110.9          58.0               10.4 +/-    0.33      12.1 +/-    0.33  0.110 / 0.380
G16     302.2          15.9                6.6 +/-    1.70      16.0 +/-    1.70  0.110 / 0.370
G20     247.8          12.5                5.7 +/-    2.70      15.0 +/-    2.70  0.060 / 0.110
G21     323.0          53.6                9.0 +/-    0.43      10.9 +/-    0.43  0.060 / 0.120
G26     274.3          18.7                9.4 +/-    1.65      21.5 +/-    1.65  0.040 / 0.050
G29     162.5          60.9               10.0 +/-    0.41      11.3 +/-    0.41  0.030 / 0.030