PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-16:57:50
G10     249.0          24.6               12.3 +/-    0.92      24.2 +/-    0.92  0.040 / 0.040
G13     56.3           32.1                8.9 +/-    1.31      14.9 +/-    1.31  0.040 / 0.040
G15     88.2           57.0               11.4 +/-    0.87      13.3 +/-    0.87  0.150 / 0.280
G16     302.9          13.2                8.2 +/-    1.99      21.4 +/-    1.99  0.130 / 0.230
G18     267.8          56.2               10.7 +/-    1.34      12.6 +/-    1.34  0.070 / 0.050
G20     40.0           51.9                9.2 +/-    0.79      11.3 +/-    0.79  0.040 / 0.040
G21     337.4          61.9                9.6 +/-    0.96      10.8 +/-    0.96  0.070 / 0.110
G26     273.2          15.9               10.6 +/-    1.10      25.7 +/-    1.10  0.050 / 0.130
G29     161.6          46.4               12.2 +/-    0.57      16.2 +/-    0.57  0.190 / 0.360