PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-16:57:30
G07     308.7          47.1               11.2 +/-    1.11      14.7 +/-    1.11  0.050 / 0.080
G08     130.1          41.5               13.2 +/-    0.80      18.8 +/-    0.80  0.050 / 0.080
G09     296.3          80.0                9.7 +/-    1.69       9.8 +/-    1.69  0.160 / 0.410
G16     42.3           21.2                8.2 +/-    1.79      17.5 +/-    1.79  0.190 / 0.450
G23     144.5          56.1               13.8 +/-    0.85      16.2 +/-    0.85  0.040 / 0.060
G27     76.0           37.1               10.9 +/-    0.96      16.7 +/-    0.96  0.030 / 0.060
G28     225.2          14.6               12.7 +/-    3.08      31.8 +/-    3.08  0.040 / 0.080
G30     288.0          24.5               11.7 +/-    1.54      23.1 +/-    1.54  0.050 / 0.080