PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-07:27:50
G10     263.9          36.0                6.1 +/-    0.86       9.5 +/-    0.86  0.130 / 0.290
G13     43.6           20.9                3.9 +/-    2.25       8.3 +/-    2.25  0.160 / 0.310
G15     61.9           50.2                4.5 +/-    0.92       5.7 +/-    0.92  0.210 / 0.070
G16     281.6          12.9                4.2 +/-    1.10      11.1 +/-    1.10  0.180 / 0.160
G20     23.7           62.2                4.2 +/-    0.68       4.6 +/-    0.68  0.060 / 0.050
G21     356.7          70.1                3.2 +/-    1.00       3.4 +/-    1.00  0.050 / 0.040
G24     122.9          12.4                4.5 +/-    3.18      11.8 +/-    3.18  0.250 / 0.190
G27     319.6          17.1                4.5 +/-    1.99      10.5 +/-    1.99  0.150 / 0.160
G29     167.7          34.3                5.2 +/-    1.56       8.4 +/-    1.56  0.040 / 0.040