PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-21:12:40
G10     278.1          44.2                8.0 +/-    2.06      10.9 +/-    2.06  0.030 / 0.040
G13     38.4           10.5                7.5 +/-    3.45      20.6 +/-    3.45  0.030 / 0.030
G15     53.6           46.0                8.4 +/-    0.87      11.2 +/-    0.87  0.100 / 0.130
G20     317.6          63.8                7.7 +/-    0.64       8.5 +/-    0.64  0.160 / 0.150
G21     34.6           76.5                8.2 +/-    0.61       8.4 +/-    0.61  0.120 / 0.210
G24     109.4          19.8                9.7 +/-    1.73      21.5 +/-    1.73  0.110 / 0.220
G27     313.9          25.1                7.4 +/-    1.55      14.4 +/-    1.55  0.090 / 0.450
G29     168.7          21.8                9.3 +/-    1.47      19.7 +/-    1.47  0.130 / 0.690
G32     205.7          18.9               10.2 +/-    4.22      23.0 +/-    4.22  0.030 / 0.060