PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-06:42:50
G10     255.0          29.9                5.1 +/-    2.28       9.0 +/-    2.28  0.030 / 0.040
G13     49.6           27.2                1.7 +/-    3.32       3.1 +/-    3.32  0.040 / 0.040
G15     75.7           55.5                4.7 +/-    1.28       5.6 +/-    1.28  0.150 / 0.530
G16     290.4          15.0                2.0 +/-    3.58       4.9 +/-    3.58  0.100 / 0.470
G20     356.8          69.8                4.0 +/-    0.57       4.2 +/-    0.57  0.060 / 0.040
G21     340.5          63.8                4.0 +/-    0.44       4.4 +/-    0.44  0.050 / 0.040
G26     262.0          13.5                3.2 +/-    1.59       8.2 +/-    1.59  0.040 / 0.050
G29     166.2          44.4                4.1 +/-    0.70       5.6 +/-    0.70  0.040 / 0.040