PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/31-14:42:40
G10     295.0          51.3                4.3 +/-    2.28       5.3 +/-    2.28  0.100 / 0.060
G15     46.6           30.6                3.0 +/-    1.06       5.2 +/-    1.06  0.090 / 0.050
G20     348.0          65.4                4.3 +/-    0.38       4.7 +/-    0.38  0.030 / 0.030
G21     97.7           71.6                5.4 +/-    0.42       5.7 +/-    0.42  0.030 / 0.030
G24     95.6           25.3                7.0 +/-    1.19      13.6 +/-    1.19  0.080 / 0.110
G27     305.0          31.4                4.8 +/-    1.52       8.1 +/-    1.52  0.100 / 0.090
G32     209.9          28.6                6.4 +/-    1.18      11.5 +/-    1.18  0.080 / 0.060