PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/21-17:12:40
G05     46.8           24.4                8.9 +/-    1.76      17.6 +/-    1.76  0.150 / 0.330
G13     81.3           36.1               11.5 +/-    1.20      17.8 +/-    1.20  0.210 / 0.350
G15     136.1          48.4               12.7 +/-    0.30      16.4 +/-    0.30  0.220 / 0.370
G16     317.8          10.7               -2.4 +/-   15.72      -6.6 +/-   15.72  0.240 / 0.530
G20     244.2          33.5               10.0 +/-    1.74      16.4 +/-    1.74  0.080 / 0.070
G21     309.9          44.8                9.3 +/-    1.06      12.6 +/-    1.06  0.070 / 0.080
G25     198.8          12.8               12.9 +/-    1.81      33.7 +/-    1.81  0.080 / 0.110
G26     292.7          20.2                9.2 +/-    1.20      20.2 +/-    1.20  0.080 / 0.100
G29     149.4          77.5               12.0 +/-    0.66      12.2 +/-    0.66  0.060 / 0.080