PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-07:13:00
G10     264.5          36.4                5.3 +/-    0.94       8.2 +/-    0.94  0.040 / 0.030
G13     43.2           20.4                3.5 +/-    2.64       7.7 +/-    2.64  0.040 / 0.050
G15     61.2           49.8                3.4 +/-    1.00       4.3 +/-    1.00  0.240 / 0.290
G16     280.9          12.7                4.1 +/-    1.87      10.8 +/-    1.87  0.350 / 0.410
G20     20.5           63.4                3.6 +/-    0.78       4.0 +/-    0.78  0.190 / 0.190
G21     357.8          70.5                4.0 +/-    0.91       4.3 +/-    0.91  0.170 / 0.140
G24     122.3          12.8                5.5 +/-    3.47      14.3 +/-    3.47  0.040 / 0.030
G27     319.4          17.6                3.3 +/-    4.62       7.7 +/-    4.62  0.040 / 0.040
G29     167.8          33.7                5.2 +/-    1.24       8.4 +/-    1.24  0.130 / 0.250