PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-08:12:30
G10     292.7          50.0                5.2 +/-    0.91       6.6 +/-    0.91  0.050 / 0.090
G15     46.6           30.3                2.7 +/-    1.13       4.7 +/-    1.13  0.060 / 0.090
G20     52.0           46.6                3.6 +/-    0.68       4.8 +/-    0.68  0.040 / 0.050
G21     85.7           75.6                6.0 +/-    0.57       6.1 +/-    0.57  0.040 / 0.050
G24     101.0          25.3                5.8 +/-    0.98      11.2 +/-    0.98  0.070 / 0.130
G27     303.1          33.2                5.5 +/-    0.92       9.0 +/-    0.92  0.060 / 0.130
G29     168.4          10.4                5.0 +/-    3.04      13.8 +/-    3.04  0.040 / 0.080
G32     209.2          30.5                6.3 +/-    2.01      10.9 +/-    2.01  0.040 / 0.070