PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-01:12:50
G08     317.4          14.2                9.1 +/-    1.85      23.0 +/-    1.85  0.080 / 0.110
G10     309.2          55.0                8.2 +/-    0.43       9.7 +/-    0.43  0.090 / 0.110
G14     212.7          21.3               13.7 +/-    1.53      29.2 +/-    1.53  0.030 / 0.040
G15     45.6           22.4                7.6 +/-    1.04      15.9 +/-    1.04  0.040 / 0.040
G18     14.4           64.3                8.0 +/-    0.67       8.7 +/-    0.67  0.030 / 0.050
G20     77.8           11.7                9.2 +/-    1.51      24.8 +/-    1.51  0.030 / 0.050
G21     117.5          67.5               11.3 +/-    0.55      12.1 +/-    0.55  0.080 / 0.250
G24     89.7           29.3               10.4 +/-    1.37      18.5 +/-    1.37  0.080 / 0.260
G27     288.6          37.6               10.0 +/-    0.83      15.2 +/-    0.83  0.040 / 0.090
G32     215.2          38.8               12.8 +/-    1.31      19.0 +/-    1.31  0.070 / 0.100