PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-17:28:00
G07     323.0          53.9               11.4 +/-    1.15      13.8 +/-    1.15  0.030 / 0.060
G08     115.4          49.5               14.2 +/-    0.60      18.0 +/-    0.60  0.030 / 0.060
G09     212.4          80.3               11.1 +/-    0.61      11.2 +/-    0.61  0.170 / 0.410
G16     45.1           11.3                8.6 +/-    1.31      23.4 +/-    1.31  0.170 / 0.440
G23     151.3          43.7               14.0 +/-    1.41      19.3 +/-    1.41  0.060 / 0.120
G27     61.5           34.4               10.7 +/-    0.83      17.2 +/-    0.83  0.060 / 0.130
G28     232.6          24.5               15.0 +/-    2.06      29.6 +/-    2.06  0.050 / 0.070
G30     297.5          32.0               10.0 +/-    1.42      16.9 +/-    1.42  0.060 / 0.080