PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-19:12:40
G07     38.5           69.8               16.0 +/-    1.22      16.9 +/-    1.22  0.040 / 0.060
G08     56.5           46.0               14.2 +/-    0.66      18.8 +/-    0.66  0.050 / 0.080
G09     179.2          41.0               18.3 +/-    1.31      26.1 +/-    1.31  0.070 / 0.120
G11     124.4          32.5               18.0 +/-    0.62      30.0 +/-    0.62  0.080 / 0.110
G18     108.0          14.5               17.9 +/-    1.64      45.0 +/-    1.64  0.050 / 0.070
G28     270.6          51.0               15.2 +/-    1.06      19.0 +/-    1.06  0.060 / 0.070
G30     330.6          58.6               14.4 +/-    0.85      16.5 +/-    0.85  0.030 / 0.030