PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-21:42:50
G01     67.5           32.5               12.5 +/-    1.35      20.9 +/-    1.35  0.120 / 0.280
G07     139.1          28.9               16.7 +/-    1.16      29.9 +/-    1.16  0.110 / 0.240
G11     52.8           30.1               11.4 +/-    1.13      19.9 +/-    1.13  0.060 / 0.080
G13     271.3          37.0               15.9 +/-    2.46      24.3 +/-    2.46  0.050 / 0.080
G15     299.9          15.9               11.8 +/-    1.85      28.8 +/-    1.85  0.170 / 0.160
G17     236.3          66.5               16.2 +/-    0.73      17.5 +/-    0.73  0.170 / 0.220
G18     47.3           17.1               10.4 +/-    2.12      24.7 +/-    2.12  0.070 / 0.040
G19     226.5          43.9               18.5 +/-    2.15      25.4 +/-    2.15  0.070 / 0.030
G28     25.3           58.4               14.3 +/-    2.53      16.5 +/-    2.53  0.040 / 0.030
G30     138.1          57.0               15.4 +/-    0.44      17.9 +/-    0.44  0.030 / 0.030