PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-15:42:40
G02     35.9           52.4                5.5 +/-    0.76       6.7 +/-    0.76  0.040 / 0.040
G05     134.4          65.6                7.5 +/-    0.56       8.1 +/-    0.56  0.040 / 0.050
G06     56.5           10.9                5.7 +/-    1.71      15.5 +/-    1.71  0.040 / 0.030
G12     191.5          61.9                6.5 +/-    0.39       7.2 +/-    0.39  0.030 / 0.030
G25     289.7          55.5                8.9 +/-    1.50      10.6 +/-    1.50  0.160 / 0.240
G29     310.4          31.2                6.6 +/-    0.89      11.3 +/-    0.89  0.190 / 0.300