PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-10:12:40
G01     320.6          13.1               -2.0 +/-   22.86      -5.2 +/-   22.86  0.040 / 0.060
G08     266.2          15.7                7.0 +/-    1.51      17.1 +/-    1.51  0.040 / 0.050
G10     70.3           56.3                6.2 +/-    0.61       7.3 +/-    0.61  0.310 / 0.240
G11     309.0          19.0                5.1 +/-    0.85      11.4 +/-    0.85  0.230 / 0.390
G14     272.8          65.6                7.9 +/-    0.59       8.6 +/-    0.59  0.150 / 0.270
G18     309.7          35.1                5.8 +/-    1.21       9.3 +/-    1.21  0.200 / 0.260
G21     155.4          10.4                5.2 +/-    2.33      14.5 +/-    2.33  0.110 / 0.170
G27     227.6          12.2                4.8 +/-    3.81      12.7 +/-    3.81  0.080 / 0.140
G31     175.6          37.6                6.2 +/-    0.96       9.4 +/-    0.96  0.300 / 0.520
G32     359.6          70.5                7.9 +/-    0.63       8.4 +/-    0.63  0.170 / 0.600