PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-14:27:50
G05     50.9           12.6                2.7 +/-    2.82       7.2 +/-    2.82  0.240 / 0.120
G10     239.8          15.8                4.8 +/-    1.36      11.7 +/-    1.36  0.250 / 0.110
G13     70.0           36.4                6.4 +/-    0.82       9.9 +/-    0.82  0.040 / 0.040
G15     112.0          55.1                6.5 +/-    0.33       7.8 +/-    0.33  0.040 / 0.040
G16     312.7          11.9                1.1 +/-   10.60       3.0 +/-   10.60  0.090 / 0.170
G18     252.2          48.4                5.6 +/-    4.59       7.2 +/-    4.59  0.090 / 0.160
G20     28.6           64.0                4.6 +/-    0.78       5.1 +/-    0.78  0.050 / 0.060
G21     323.6          54.7                3.8 +/-    0.42       4.6 +/-    0.42  0.030 / 0.070
G26     284.0          19.2                3.4 +/-    0.68       7.6 +/-    0.68  0.290 / 0.350
G29     157.0          61.7                8.2 +/-    0.48       9.2 +/-    0.48  0.200 / 0.310