PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-19:12:30
G07     22.1           68.9               11.5 +/-    1.06      12.2 +/-    1.06  0.120 / 0.230
G08     63.3           49.7               13.3 +/-    0.69      16.9 +/-    0.69  0.100 / 0.200
G09     180.1          47.1               16.1 +/-    1.73      21.1 +/-    1.73  0.100 / 0.350
G11     129.5          28.9               17.3 +/-    1.09      31.1 +/-    1.09  0.070 / 0.340
G18     112.8          11.6               14.3 +/-    1.55      38.5 +/-    1.55  0.100 / 0.180
G23     158.8          12.9               15.5 +/-    5.35      40.5 +/-    5.35  0.100 / 0.180
G27     39.3           14.5                9.4 +/-    1.38      23.6 +/-    1.38  0.050 / 0.090
G28     263.0          47.7               14.9 +/-    1.10      19.3 +/-    1.10  0.060 / 0.090
G30     324.9          54.3               12.6 +/-    0.62      15.2 +/-    0.62  0.030 / 0.080