PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/15-21:43:00
G10     283.4          46.7                9.9 +/-    2.02      13.0 +/-    2.02  0.030 / 0.040
G15     50.9           42.5                8.1 +/-    0.83      11.3 +/-    0.83  0.040 / 0.040
G20     327.5          64.7                9.3 +/-    0.55      10.2 +/-    0.55  0.070 / 0.100
G21     53.3           77.2                9.5 +/-    0.40       9.7 +/-    0.40  0.080 / 0.130
G24     105.4          21.9                9.8 +/-    1.54      20.6 +/-    1.54  0.090 / 0.160
G27     310.8          28.0                7.4 +/-    1.64      13.4 +/-    1.64  0.080 / 0.190
G29     168.7          17.6               10.9 +/-    0.62      25.5 +/-    0.62  0.120 / 0.150
G32     206.8          23.1               11.4 +/-    1.60      23.2 +/-    1.60  0.190 / 0.210