PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-19:58:00
G01     118.4          18.5               16.6 +/-    1.83      37.8 +/-    1.83  0.040 / 0.060
G07     81.8           66.5               13.6 +/-    0.67      14.7 +/-    0.67  0.040 / 0.050
G08     45.8           34.5               11.3 +/-    1.01      18.1 +/-    1.01  0.110 / 0.170
G09     177.4          25.7               16.9 +/-    2.66      32.5 +/-    2.66  0.110 / 0.190
G11     108.0          40.3               15.8 +/-    1.10      22.9 +/-    1.10  0.120 / 0.210
G13     317.5          19.7               11.1 +/-    1.18      24.5 +/-    1.18  0.100 / 0.180
G18     94.0           21.2               14.4 +/-    1.96      30.7 +/-    1.96  0.040 / 0.030
G28     295.0          57.9               13.3 +/-    1.08      15.4 +/-    1.08  0.030 / 0.030
G30     352.8          70.5               12.9 +/-    0.81      13.6 +/-    0.81  0.030 / 0.040