PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-20:57:40
G10     272.3          41.3                9.7 +/-    1.78      13.8 +/-    1.78  0.080 / 0.030
G13     39.9           14.4                8.1 +/-    2.21      20.6 +/-    2.21  0.080 / 0.040
G15     57.9           49.9                9.2 +/-    0.66      11.6 +/-    0.66  0.160 / 0.200
G20     306.9          62.2               10.1 +/-    0.67      11.2 +/-    0.67  0.120 / 0.140
G21     16.5           74.5               10.3 +/-    0.78      10.6 +/-    0.78  0.120 / 0.210
G24     113.8          17.1               11.3 +/-    2.03      26.8 +/-    2.03  0.110 / 0.210
G27     316.9          21.5                8.3 +/-    2.15      17.7 +/-    2.15  0.150 / 0.300
G29     168.4          26.8               11.1 +/-    0.83      20.9 +/-    0.83  0.290 / 0.360
G32     204.7          14.3               11.3 +/-    2.94      28.5 +/-    2.94  0.030 / 0.050