PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-14:27:50
G10     262.0          35.6                4.6 +/-    0.93       7.2 +/-    0.93  0.040 / 0.050
G13     44.3           21.6                3.5 +/-    1.00       7.5 +/-    1.00  0.040 / 0.040
G15     66.2           53.1                5.7 +/-    0.36       7.0 +/-    0.36  0.070 / 0.260
G16     285.6          13.3                3.7 +/-    1.64       9.7 +/-    1.64  0.070 / 0.250
G20     288.8          58.0                6.1 +/-    0.96       7.1 +/-    0.96  0.070 / 0.070
G21     1.7            70.3                4.1 +/-    0.80       4.4 +/-    0.80  0.080 / 0.080
G24     120.5          11.9                7.3 +/-    1.39      19.6 +/-    1.39  0.080 / 0.270
G26     259.9          10.2                1.5 +/-    4.33       4.2 +/-    4.33  0.090 / 0.330
G27     321.5          12.7                2.6 +/-    4.60       6.9 +/-    4.60  0.100 / 0.200
G29     166.0          34.8                6.7 +/-    0.74      10.6 +/-    0.74  0.110 / 0.200