PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-12:13:00
G05     50.3           13.2                1.0 +/-    1.04       2.6 +/-    1.04  0.140 / 0.160
G10     238.6          14.6                3.3 +/-    2.37       8.4 +/-    2.37  0.090 / 0.160
G13     72.0           36.6                6.5 +/-    1.24      10.0 +/-    1.24  0.030 / 0.040
G15     115.1          54.3                7.6 +/-    0.72       9.1 +/-    0.72  0.040 / 0.030
G16     313.0          12.2                3.5 +/-    1.90       9.3 +/-    1.90  0.070 / 0.070
G18     250.5          47.6                6.9 +/-    3.16       9.0 +/-    3.16  0.050 / 0.040
G20     24.5           67.0                5.5 +/-    0.80       6.0 +/-    0.80  0.090 / 0.190
G21     319.8          52.2                3.6 +/-    0.75       4.5 +/-    0.75  0.110 / 0.190
G26     284.6          19.8                3.7 +/-    1.36       8.1 +/-    1.36  0.190 / 0.320
G29     156.7          65.3                8.2 +/-    0.56       8.9 +/-    0.56  0.240 / 0.260