PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/21-16:27:40
G08     302.1          22.4                6.0 +/-    1.74      12.6 +/-    1.74  0.050 / 0.070
G10     346.0          61.7                5.7 +/-    0.46       6.4 +/-    0.46  0.060 / 0.070
G14     221.5          37.4                6.8 +/-    1.28      10.3 +/-    1.28  0.030 / 0.040
G20     49.2           57.5                6.8 +/-    0.67       7.9 +/-    0.67  0.030 / 0.040
G21     139.6          47.3                9.7 +/-    1.18      12.6 +/-    1.18  0.080 / 0.100
G24     62.8           26.7                7.1 +/-    1.45      13.4 +/-    1.45  0.080 / 0.110
G27     270.0          35.6                8.7 +/-    1.02      13.7 +/-    1.02  0.050 / 0.130
G32     229.2          57.3                7.9 +/-    0.58       9.2 +/-    0.58  0.050 / 0.120