PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/15-21:57:40
G10     257.1          33.2                8.3 +/-    2.14      13.6 +/-    2.14  0.160 / 0.530
G13     47.2           24.4                8.3 +/-    2.43      16.5 +/-    2.43  0.140 / 0.560
G15     73.1           55.3                9.0 +/-    0.72      10.7 +/-    0.72  0.050 / 0.040
G16     288.7          15.0                5.0 +/-    2.38      12.3 +/-    2.38  0.040 / 0.040
G20     280.8          55.3                8.8 +/-    2.46      10.5 +/-    2.46  0.060 / 0.240
G21     342.7          64.4                9.0 +/-    0.85       9.8 +/-    0.85  0.120 / 0.180
G26     261.7          12.5                7.9 +/-   14.62      20.9 +/-   14.62  0.030 / 0.040
G29     165.3          42.1                9.4 +/-    0.89      13.2 +/-    0.89  0.040 / 0.030