PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-18:57:50
G10     244.4          23.1                9.8 +/-    1.12      20.0 +/-    1.12  0.040 / 0.060
G13     60.3           32.3                8.0 +/-    1.12      13.4 +/-    1.12  0.050 / 0.060
G15     102.2          57.7               11.3 +/-    1.08      13.1 +/-    1.08  0.070 / 0.150
G16     302.6          15.6                5.9 +/-    1.71      14.4 +/-    1.71  0.070 / 0.120
G20     261.5          46.9                9.7 +/-    4.64      12.8 +/-    4.64  0.030 / 0.050
G21     325.0          54.2                9.5 +/-    0.77      11.5 +/-    0.77  0.040 / 0.030
G26     275.3          18.0                8.6 +/-    1.44      19.9 +/-    1.44  0.140 / 0.440
G29     160.9          59.4               11.6 +/-    0.45      13.2 +/-    0.45  0.140 / 0.550