PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-04:12:50
G08     271.1          19.6               10.8 +/-    1.82      23.9 +/-    1.82  0.110 / 0.490
G10     53.6           59.8                5.8 +/-    0.94       6.5 +/-    0.94  0.130 / 0.140
G14     256.1          61.5                7.9 +/-    0.67       8.8 +/-    0.67  0.150 / 0.260
G18     314.3          28.2                7.1 +/-    1.19      12.9 +/-    1.19  0.150 / 0.270
G20     78.6           54.3               14.6 +/-    0.72      17.5 +/-    0.72  0.360 / 0.270
G21     154.2          20.1                7.3 +/-    2.60      16.1 +/-    2.60  0.170 / 0.250
G24     40.8           11.9                5.7 +/-    1.92      15.3 +/-    1.92  0.050 / 0.050
G27     235.0          18.6                9.9 +/-    5.72      22.4 +/-    5.72  0.050 / 0.050
G31     177.5          28.0                8.5 +/-    1.76      15.6 +/-    1.76  0.120 / 0.230
G32     331.6          75.6                7.3 +/-    0.65       7.5 +/-    0.65  0.120 / 0.270