PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-02:57:40
G02     54.6           36.2                5.3 +/-    1.42       8.2 +/-    1.42  0.110 / 0.430
G05     68.4           65.0                5.4 +/-    0.83       5.9 +/-    0.83  0.190 / 0.430
G12     188.0          42.3                6.8 +/-    0.78       9.6 +/-    0.78  0.060 / 0.060
G13     132.3          10.5                0.0 +/-   20.24       0.1 +/-   20.24  0.050 / 0.070
G21     266.8          14.5                7.6 +/-    3.12      19.2 +/-    3.12  0.030 / 0.020
G25     246.3          56.1                6.1 +/-    1.47       7.2 +/-    1.47  0.040 / 0.030
G29     327.7          52.3                6.3 +/-    1.49       7.7 +/-    1.49  0.150 / 0.500