PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-20:42:40
G10     263.0          35.9                9.4 +/-    1.97      14.6 +/-    1.97  0.160 / 0.330
G13     43.8           21.0                7.2 +/-    1.59      15.5 +/-    1.59  0.150 / 0.430
G15     69.2           56.0                7.9 +/-    0.54       9.3 +/-    0.54  0.040 / 0.050
G16     282.1          13.4                7.4 +/-    1.30      19.0 +/-    1.30  0.050 / 0.060
G20     290.3          58.5                8.7 +/-    1.48      10.0 +/-    1.48  0.140 / 0.340
G21     354.6          69.3                8.7 +/-    0.85       9.2 +/-    0.85  0.140 / 0.420
G24     121.1          12.3               10.3 +/-    1.66      27.5 +/-    1.66  0.080 / 0.270
G27     320.6          14.8                6.1 +/-    2.99      15.3 +/-    2.99  0.070 / 0.250
G29     167.5          35.8                9.4 +/-    1.11      14.7 +/-    1.11  0.110 / 0.330