PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-05:27:50
G05     46.5           22.9                1.4 +/-    0.91       2.9 +/-    0.91  0.050 / 0.140
G13     88.0           36.1                4.3 +/-    0.68       6.7 +/-    0.68  0.050 / 0.110
G15     135.2          45.9                6.6 +/-    0.60       8.8 +/-    0.60  0.110 / 0.500
G20     253.5          63.9                5.2 +/-    0.47       5.7 +/-    0.47  0.110 / 0.710
G21     304.8          41.3                4.4 +/-    1.07       6.3 +/-    1.07  0.030 / 0.050
G25     204.9          18.5                4.0 +/-    1.83       9.1 +/-    1.83  0.040 / 0.050
G26     295.6          20.8                4.0 +/-    1.98       8.7 +/-    1.98  0.020 / 0.030
G29     141.2          82.8                3.4 +/-    0.66       3.5 +/-    0.66  0.020 / 0.030