PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/17-14:42:30
G02     228.4          66.3                8.5 +/-    1.64       9.2 +/-    1.64  0.130 / 0.090
G06     43.0           63.1                7.6 +/-    0.44       8.4 +/-    0.44  0.110 / 0.090
G12     322.0          49.5                7.4 +/-    0.96       9.3 +/-    0.96  0.040 / 0.050
G17     67.0           24.4                8.1 +/-    1.35      16.0 +/-    1.35  0.040 / 0.040
G19     46.7           46.0                7.3 +/-    1.26       9.7 +/-    1.26  0.050 / 0.030
G24     248.4          37.7                9.9 +/-    1.06      14.9 +/-    1.06  0.040 / 0.040