PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-11:57:40
G02     55.0           35.8                3.6 +/-    1.51       5.6 +/-    1.51  0.030 / 0.020
G05     72.1           66.6                4.1 +/-    0.48       4.4 +/-    0.48  0.030 / 0.020
G12     188.2          41.8                6.2 +/-    1.23       8.8 +/-    1.23  0.050 / 0.040
G13     134.8          10.2               -3.8 +/-   15.04     -10.6 +/-   15.04  0.040 / 0.050
G20     205.9          49.0                7.5 +/-    0.90       9.6 +/-    0.90  0.040 / 0.320
G21     267.1          17.1                5.3 +/-    4.42      12.5 +/-    4.42  0.040 / 0.050
G25     249.1          56.1                6.4 +/-    2.55       7.6 +/-    2.55  0.070 / 0.060
G29     326.3          51.3                2.9 +/-    1.37       3.5 +/-    1.37  0.050 / 0.040