PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-19:27:20
G10     252.6          30.0               11.1 +/-    1.83      19.5 +/-    1.83  0.040 / 0.050
G13     50.9           27.3                6.5 +/-    2.81      12.0 +/-    2.81  0.040 / 0.050
G15     82.0           57.2               10.2 +/-    1.12      11.9 +/-    1.12  0.110 / 0.190
G20     274.4          53.2               10.8 +/-    3.40      13.1 +/-    3.40  0.120 / 0.160
G21     336.3          61.0               10.0 +/-    0.66      11.2 +/-    0.66  0.030 / 0.040
G26     265.9          14.6                9.4 +/-    2.45      23.6 +/-    2.45  0.030 / 0.030
G29     164.4          48.2               11.3 +/-    0.60      14.6 +/-    0.60  0.110 / 0.310