PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-17:27:30
G07     301.2          43.2               12.2 +/-    2.82      16.9 +/-    2.82  0.130 / 0.040
G08     137.3          35.8               14.8 +/-    0.69      23.1 +/-    0.69  0.050 / 0.040
G09     313.6          73.4               12.4 +/-    0.91      12.8 +/-    0.91  0.080 / 0.060
G16     41.7           27.5                7.9 +/-    1.27      14.7 +/-    1.27  0.040 / 0.050
G23     138.5          64.0               12.4 +/-    0.68      13.7 +/-    0.68  0.130 / 0.150
G27     84.9           36.8               10.6 +/-    0.83      16.2 +/-    0.83  0.160 / 0.150
G30     282.8          20.6               12.2 +/-    3.14      26.5 +/-    3.14  0.110 / 0.050