PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-14:43:10
G02     255.1          76.4                7.1 +/-    0.41       7.3 +/-    0.41  0.120 / 0.240
G05     172.0          19.3                9.6 +/-    2.22      21.6 +/-    2.22  0.070 / 0.190
G06     40.0           51.5                6.7 +/-    0.52       8.3 +/-    0.52  0.070 / 0.130
G12     321.5          61.1                8.9 +/-    1.47      10.1 +/-    1.47  0.080 / 0.120
G17     76.5           17.4                7.1 +/-    0.64      16.5 +/-    0.64  0.060 / 0.050
G19     59.6           38.7                7.8 +/-    0.87      11.5 +/-    0.87  0.030 / 0.040
G24     236.3          30.8                8.8 +/-    0.74      15.1 +/-    0.74  0.110 / 0.330
G25     317.4          19.6                6.6 +/-    0.96      14.6 +/-    0.96  0.170 / 0.290