PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-15:28:10
G10     262.8          35.0                6.0 +/-    1.64       9.5 +/-    1.64  0.140 / 0.190
G13     44.4           22.2                4.0 +/-    1.68       8.4 +/-    1.68  0.110 / 0.140
G15     62.4           50.1                6.9 +/-    0.50       8.6 +/-    0.50  0.050 / 0.050
G16     286.7          12.3                6.3 +/-    2.14      16.6 +/-    2.14  0.040 / 0.040
G18     296.4          64.3                6.1 +/-    0.90       6.7 +/-    0.90  0.100 / 0.240
G20     50.2           40.5                4.1 +/-    0.85       5.9 +/-    0.85  0.050 / 0.080
G21     9.1            71.8                6.3 +/-    0.76       6.6 +/-    0.76  0.050 / 0.090
G24     124.5          11.7              -15.1 +/-   27.85     -40.7 +/-   27.85  0.080 / 0.250
G27     319.6          17.0                3.9 +/-    0.82       9.2 +/-    0.82  0.080 / 0.240
G29     165.8          31.4               10.3 +/-    1.33      17.5 +/-    1.33  0.180 / 0.470