PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-07:12:50
G10     264.5          36.4                5.0 +/-    0.92       7.7 +/-    0.92  0.120 / 0.290
G13     43.2           20.4                2.5 +/-    1.14       5.3 +/-    1.14  0.130 / 0.340
G15     61.2           49.8                3.9 +/-    0.64       4.9 +/-    0.64  0.110 / 0.130
G16     280.9          12.7                3.5 +/-    1.99       9.2 +/-    1.99  0.110 / 0.110
G20     20.5           63.4                4.3 +/-    0.49       4.8 +/-    0.49  0.040 / 0.050
G21     357.8          70.5                4.0 +/-    0.42       4.2 +/-    0.42  0.040 / 0.050
G24     122.3          12.8                4.2 +/-    1.14      11.1 +/-    1.14  0.070 / 0.080
G27     319.4          17.6                3.0 +/-    1.43       7.1 +/-    1.43  0.080 / 0.080
G29     167.8          33.7                6.4 +/-    0.76      10.4 +/-    0.76  0.080 / 0.370