PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-08:12:50
G10     303.5          53.6                3.5 +/-    0.46       4.2 +/-    0.46  0.050 / 0.120
G14     212.1          12.3               -0.7 +/-   13.04      -1.8 +/-   13.04  0.040 / 0.130
G15     45.6           23.8                2.4 +/-    2.94       4.7 +/-    2.94  0.180 / 0.690
G20     57.7           43.6                4.5 +/-    1.54       6.1 +/-    1.54  0.160 / 0.360
G21     108.7          71.2                5.7 +/-    0.76       6.0 +/-    0.76  0.060 / 0.070
G24     92.9           28.0                4.6 +/-    1.54       8.4 +/-    1.54  0.050 / 0.080
G27     295.0          36.1                4.2 +/-    1.30       6.5 +/-    1.30  0.030 / 0.040
G32     212.4          37.8                5.3 +/-    1.31       8.0 +/-    1.31  0.030 / 0.040