PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-09:42:50
G02     253.6          79.7                5.6 +/-    0.41       5.7 +/-    0.41  0.190 / 0.140
G05     171.0          18.3                5.8 +/-    1.73      13.4 +/-    1.73  0.090 / 0.110
G06     38.9           61.9                3.3 +/-    0.62       3.7 +/-    0.62  0.070 / 0.110
G12     321.1          53.0                5.1 +/-    0.52       6.3 +/-    0.52  0.090 / 0.110
G17     73.9           20.0                4.3 +/-    1.05       9.4 +/-    1.05  0.040 / 0.040
G19     60.9           36.0                4.0 +/-    0.74       6.2 +/-    0.74  0.030 / 0.040
G24     244.0          33.5                7.5 +/-    2.07      12.3 +/-    2.07  0.220 / 0.410
G25     317.2          14.8                4.0 +/-    1.84      10.0 +/-    1.84  0.170 / 0.220