PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/08-19:42:40
G07     9.1            67.3               10.9 +/-    0.97      11.7 +/-    0.97  0.040 / 0.040
G08     71.3           52.6               10.3 +/-    0.76      12.6 +/-    0.76  0.040 / 0.050
G09     181.2          52.7               13.0 +/-    0.98      15.8 +/-    0.98  0.040 / 0.050
G11     133.9          25.5               15.1 +/-    4.33      29.1 +/-    4.33  0.040 / 0.050
G23     158.6          18.1               14.2 +/-    1.13      32.7 +/-    1.13  0.070 / 0.180
G27     41.2           18.3                9.3 +/-    2.50      21.3 +/-    2.50  0.090 / 0.160
G28     256.8          44.5               12.5 +/-    3.79      17.0 +/-    3.79  0.020 / 0.030
G30     320.4          50.8               11.4 +/-    0.62      14.2 +/-    0.62  0.030 / 0.040