PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-19:12:00
G02     44.5           46.0                8.5 +/-    0.50      11.3 +/-    0.50  0.030 / 0.040
G05     99.4           69.8               10.7 +/-    0.55      11.3 +/-    0.55  0.050 / 0.040
G12     183.9          46.6               13.0 +/-    1.05      17.1 +/-    1.05  0.050 / 0.080
G25     265.6          58.9               10.9 +/-    0.70      12.5 +/-    0.70  0.040 / 0.090
G29     317.0          38.8               10.3 +/-    1.12      15.3 +/-    1.12  0.040 / 0.060