PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/18-19:12:00
G02     41.4           48.6                9.9 +/-    0.39      12.7 +/-    0.39  0.040 / 0.040
G05     111.2          69.2               11.1 +/-    1.40      11.8 +/-    1.40  0.040 / 0.040
G12     184.7          50.8               12.3 +/-    1.19      15.3 +/-    1.19  0.060 / 0.070
G25     273.6          58.8               10.8 +/-    0.70      12.4 +/-    0.70  0.050 / 0.060
G29     314.6          35.8               10.5 +/-    1.04      16.4 +/-    1.04  0.040 / 0.040