PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/30-16:27:00
G02     45.2           45.5                7.4 +/-    1.07       9.9 +/-    1.07  0.040 / 0.050
G05     103.6          71.1                8.7 +/-    0.89       9.1 +/-    0.89  0.040 / 0.040
G12     185.6          46.9               10.2 +/-    0.66      13.4 +/-    0.66  0.050 / 0.050
G25     259.0          59.2                9.5 +/-    1.18      10.8 +/-    1.18  0.050 / 0.050
G29     318.5          40.8                8.1 +/-    0.80      11.7 +/-    0.80  0.030 / 0.030