PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-14:12:40
G05     49.1           16.4                1.4 +/-    0.85       3.5 +/-    0.85  0.110 / 0.210
G10     236.6          12.2                2.1 +/-    1.16       5.7 +/-    1.16  0.080 / 0.250
G13     76.2           37.1                3.8 +/-    0.94       5.8 +/-    0.94  0.050 / 0.060
G15     120.5          52.7                5.6 +/-    0.72       6.9 +/-    0.72  0.050 / 0.070
G18     246.9          44.7                5.4 +/-    1.29       7.4 +/-    1.29  0.040 / 0.050
G20     23.3           68.7                4.2 +/-    0.65       4.5 +/-    0.65  0.050 / 0.050
G21     318.2          51.5                4.4 +/-    1.42       5.4 +/-    1.42  0.120 / 0.210
G25     199.1          10.2                3.5 +/-   13.11       9.8 +/-   13.11  0.120 / 0.260
G26     289.0          19.7                4.3 +/-    2.40       9.5 +/-    2.40  0.260 / 0.520
G29     153.7          67.4                6.2 +/-    0.51       6.6 +/-    0.51  0.270 / 0.440