PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-14:27:50
G02     55.2           35.8                5.9 +/-    0.52       9.3 +/-    0.52  0.020 / 0.030
G05     73.1           68.6                7.1 +/-    0.68       7.6 +/-    0.68  0.030 / 0.030
G12     183.3          37.0                8.3 +/-    1.00      12.7 +/-    1.00  0.040 / 0.050
G13     130.7          11.3                7.1 +/-   13.67      19.2 +/-   13.67  0.040 / 0.060
G21     267.3          13.5                5.2 +/-    4.38      13.4 +/-    4.38  0.150 / 0.310
G25     246.6          55.4                8.5 +/-    1.28      10.1 +/-    1.28  0.140 / 0.310
G29     324.4          48.6                7.5 +/-    1.10       9.6 +/-    1.10  0.050 / 0.090