PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-13:42:40
G02     38.7           49.9                4.4 +/-    1.27       5.6 +/-    1.27  0.030 / 0.030
G05     135.6          66.2                6.7 +/-    0.64       7.3 +/-    0.64  0.030 / 0.030
G06     57.1           10.1                6.6 +/-    1.83      18.3 +/-    1.83  0.040 / 0.030
G12     188.7          59.5                7.1 +/-    0.43       8.1 +/-    0.43  0.040 / 0.040
G25     287.1          56.3                3.1 +/-    1.81       3.7 +/-    1.81  0.230 / 0.350
G29     311.0          31.9                6.2 +/-    0.92      10.4 +/-    0.92  0.200 / 0.320