PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/28-21:58:00
G07     345.9          62.2               10.1 +/-    0.97      11.3 +/-    0.97  0.040 / 0.050
G08     88.4           53.8               11.3 +/-    0.70      13.6 +/-    0.70  0.040 / 0.050
G09     185.8          65.5               13.1 +/-    0.85      14.3 +/-    0.85  0.060 / 0.110
G11     143.0          17.5               17.2 +/-    2.22      40.1 +/-    2.22  0.070 / 0.130
G23     157.3          31.1               14.0 +/-    0.72      23.9 +/-    0.72  0.070 / 0.120
G27     47.5           26.1               11.0 +/-    0.79      21.0 +/-    0.79  0.070 / 0.100
G28     245.0          36.7               13.0 +/-    1.45      20.1 +/-    1.45  0.050 / 0.130
G30     311.6          44.1                8.0 +/-    0.98      10.9 +/-    0.98  0.060 / 0.110