PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/25-12:12:40
G02     63.1           28.9                4.0 +/-    1.28       7.2 +/-    1.28  0.030 / 0.030
G05     54.6           58.6                5.0 +/-    0.54       5.8 +/-    0.54  0.020 / 0.030
G12     185.7          30.8                5.7 +/-    1.97       9.8 +/-    1.97  0.100 / 0.090
G13     127.0          17.1                7.8 +/-    2.20      18.4 +/-    2.20  0.080 / 0.080
G15     160.9          15.0                5.0 +/-    1.73      12.3 +/-    1.73  0.050 / 0.040
G20     211.3          60.1                8.3 +/-    0.65       9.5 +/-    0.65  0.040 / 0.030
G21     275.5          23.3                4.2 +/-    1.27       8.6 +/-    1.27  0.090 / 0.080
G25     232.7          49.7                8.2 +/-    2.51      10.4 +/-    2.51  0.110 / 0.090
G29     333.8          60.9                3.1 +/-    0.26       3.5 +/-    0.26  0.110 / 0.270