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                8.5 +/-    2.89      21.6 +/-    2.89  0.080 / 0.080
G10     309.2          55.0                8.8 +/-    1.69      10.5 +/-    1.69  0.100 / 0.120
G14     212.7          21.3               13.3 +/-    2.10      28.4 +/-    2.10  0.080 / 0.080
G15     45.6           22.4                8.7 +/-    2.66      18.2 +/-    2.66  0.060 / 0.050
G18     14.4           64.3                8.4 +/-    1.16       9.2 +/-    1.16  0.030 / 0.040
G20     77.8           11.7                9.8 +/-    1.39      26.2 +/-    1.39  0.030 / 0.030
G21     117.5          67.5               12.4 +/-    0.98      13.3 +/-    0.98  0.060 / 0.080
G24     89.7           29.3               11.8 +/-    0.97      21.0 +/-    0.97  0.050 / 0.070
G27     288.6          37.6                8.1 +/-    1.22      12.3 +/-    1.22  0.170 / 0.210
G32     215.2          38.8               12.1 +/-    0.99      17.9 +/-    0.99  0.170 / 0.180