PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-14:27:40
G05     49.5           15.5                2.8 +/-    3.13       7.0 +/-    3.13  0.090 / 0.310
G10     237.4          13.1                4.3 +/-    2.19      11.1 +/-    2.19  0.160 / 0.330
G13     74.7           37.0                5.0 +/-    0.52       7.7 +/-    0.52  0.040 / 0.070
G15     118.6          53.3                8.3 +/-    0.72      10.0 +/-    0.72  0.040 / 0.070
G16     316.0          10.7               -5.2 +/-   13.53     -14.2 +/-   13.53  0.110 / 0.240
G18     248.2          45.6                5.1 +/-    2.23       6.8 +/-    2.23  0.100 / 0.250
G20     25.0           67.4                4.7 +/-    0.52       5.0 +/-    0.52  0.040 / 0.040
G21     319.7          52.4                2.9 +/-    1.29       3.6 +/-    1.29  0.040 / 0.040
G26     287.8          19.6                4.1 +/-    1.32       9.2 +/-    1.32  0.150 / 0.470
G29     154.5          65.8                5.1 +/-    0.98       5.6 +/-    0.98  0.170 / 0.510