PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/21-18:12:30
G05     46.4           24.2                8.2 +/-    1.60      16.3 +/-    1.60  0.090 / 0.090
G13     82.7           35.2               11.8 +/-    1.10      18.7 +/-    1.10  0.060 / 0.090
G15     133.2          48.0               11.9 +/-    0.52      15.4 +/-    0.52  0.070 / 0.110
G20     243.3          33.3                9.3 +/-    2.14      15.3 +/-    2.14  0.060 / 0.120
G21     307.3          42.2                8.9 +/-    0.83      12.5 +/-    0.83  0.040 / 0.050
G25     203.2          16.9               10.7 +/-    5.34      25.4 +/-    5.34  0.040 / 0.040
G26     293.9          20.2                7.6 +/-    1.72      16.7 +/-    1.72  0.120 / 0.330
G29     143.1          80.4                9.4 +/-    0.60       9.6 +/-    0.60  0.120 / 0.320