PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-03:12:40
G02     51.3           39.3                6.7 +/-    1.69       9.9 +/-    1.69  0.050 / 0.060
G05     79.4           67.3                7.9 +/-    0.44       8.5 +/-    0.44  0.040 / 0.050
G12     187.6          45.2               12.0 +/-    0.92      16.1 +/-    0.92  0.030 / 0.030
G20     213.0          14.7               12.1 +/-    3.63      30.3 +/-    3.63  0.030 / 0.030
G25     259.0          57.4               10.8 +/-    1.79      12.5 +/-    1.79  0.040 / 0.040
G29     320.7          43.7                8.7 +/-    0.94      12.0 +/-    0.94  0.030 / 0.050