PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/17-18:57:50
G02     229.4          69.5                9.4 +/-    0.84      10.0 +/-    0.84  0.230 / 0.410
G05     173.8          11.7                9.7 +/-   18.11      26.0 +/-   18.11  0.240 / 0.480
G06     42.8           61.9                9.2 +/-    0.68      10.3 +/-    0.68  0.060 / 0.100
G12     322.2          50.0                8.1 +/-    0.67      10.2 +/-    0.67  0.050 / 0.110
G17     66.6           25.5               10.3 +/-    2.37      19.9 +/-    2.37  0.030 / 0.040
G19     49.1           44.3               11.4 +/-    1.57      15.5 +/-    1.57  0.030 / 0.030
G24     249.6          37.5               11.0 +/-    1.51      16.7 +/-    1.51  0.040 / 0.040