PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-13:13:10
G07     41.3           69.7                8.1 +/-    0.67       8.6 +/-    0.67  0.030 / 0.030
G08     53.1           41.8                6.5 +/-    1.19       9.2 +/-    1.19  0.030 / 0.040
G09     177.2          38.4                8.7 +/-    0.67      13.0 +/-    0.67  0.040 / 0.030
G11     121.5          33.2                8.7 +/-    1.08      14.3 +/-    1.08  0.040 / 0.020
G17     199.6          11.3               -4.4 +/-   15.64     -12.0 +/-   15.64  0.180 / 0.300
G18     106.8          14.8                8.1 +/-    1.92      20.2 +/-    1.92  0.190 / 0.350
G23     160.3          10.1                6.2 +/-    1.96      17.1 +/-    1.96  0.170 / 0.230
G27     37.7           10.2                6.7 +/-    3.53      18.5 +/-    3.53  0.070 / 0.270
G28     270.6          50.8                7.5 +/-    2.45       9.4 +/-    2.45  0.200 / 0.480
G30     327.9          56.8                7.3 +/-    0.63       8.5 +/-    0.63  0.160 / 0.360