PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/21-21:28:00
G10     254.8          31.6               11.5 +/-    1.65      19.6 +/-    1.65  0.040 / 0.110
G13     49.0           25.9                8.6 +/-    1.79      16.5 +/-    1.79  0.040 / 0.050
G15     77.8           56.5                9.2 +/-    0.68      10.7 +/-    0.68  0.150 / 0.160
G16     291.0          15.4                8.3 +/-    1.25      20.4 +/-    1.25  0.140 / 0.190
G20     277.2          54.0                9.7 +/-    3.32      11.7 +/-    3.32  0.030 / 0.040
G21     339.3          62.7                8.8 +/-    0.66       9.8 +/-    0.66  0.040 / 0.040
G26     263.9          13.6                7.5 +/-    2.20      19.3 +/-    2.20  0.130 / 0.320
G29     164.8          45.0               10.0 +/-    1.04      13.5 +/-    1.04  0.150 / 0.280