PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-15:27:20
G02     230.6          71.1                8.3 +/-    0.61       8.7 +/-    0.61  0.340 / 0.410
G06     42.4           63.9                7.6 +/-    0.35       8.4 +/-    0.35  0.420 / 0.570
G12     321.3          47.5                7.9 +/-    0.59      10.2 +/-    0.59  0.040 / 0.050
G17     69.2           22.6                6.7 +/-    2.44      13.8 +/-    2.44  0.030 / 0.050
G19     54.9           39.6                7.7 +/-    1.31      11.3 +/-    1.31  0.030 / 0.030
G24     252.0          37.2                8.7 +/-    1.79      13.3 +/-    1.79  0.030 / 0.030
G25     316.1          11.5               -8.7 +/-   31.23     -23.5 +/-   31.23  0.070 / 0.120