PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-13:13:00
G05     47.9           19.6                1.9 +/-    2.19       4.1 +/-    2.19  0.050 / 0.060
G10     234.9          11.5               -6.3 +/-   25.72     -17.0 +/-   25.72  0.030 / 0.070
G13     77.8           36.1                4.3 +/-    1.13       6.6 +/-    1.13  0.050 / 0.090
G15     128.9          51.0                5.4 +/-    0.73       6.7 +/-    0.73  0.090 / 0.080
G16     317.2          10.7               -3.6 +/-    9.84     -10.0 +/-    9.84  0.420 / 0.300
G20     246.5          35.6                5.3 +/-    2.05       8.3 +/-    2.05  0.420 / 0.410
G21     314.6          48.5                3.2 +/-    0.87       4.1 +/-    0.87  0.170 / 0.240
G26     292.3          19.3                2.7 +/-    1.75       6.1 +/-    1.75  0.140 / 0.180
G29     150.9          72.7                5.3 +/-    1.50       5.6 +/-    1.50  0.180 / 0.300