PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-07:13:10
G10     259.4          33.1                7.1 +/-    1.77      11.6 +/-    1.77  0.130 / 0.270
G13     46.2           24.1                3.3 +/-    0.94       6.5 +/-    0.94  0.110 / 0.330
G15     67.9           53.0                4.5 +/-    0.25       5.5 +/-    0.25  0.130 / 0.190
G16     285.8          14.1                3.1 +/-    0.67       7.8 +/-    0.67  0.110 / 0.200
G20     14.9           65.6                2.9 +/-    0.59       3.2 +/-    0.59  0.040 / 0.050
G21     348.2          67.1                1.7 +/-    0.95       1.9 +/-    0.95  0.040 / 0.050
G26     257.9          11.3                4.9 +/-    1.73      13.4 +/-    1.73  0.080 / 0.100
G27     321.1          13.5                3.4 +/-    3.86       8.8 +/-    3.86  0.070 / 0.100
G29     167.0          39.1                5.9 +/-    1.47       8.7 +/-    1.47  0.040 / 0.050