PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-16:57:30
G10     293.0          49.9                9.2 +/-    2.94      11.6 +/-    2.94  0.050 / 0.100
G15     46.3           29.2                7.6 +/-    1.25      13.6 +/-    1.25  0.050 / 0.080
G18     356.9          66.3                9.3 +/-    0.41      10.1 +/-    0.41  0.080 / 0.160
G20     68.6           22.0                7.9 +/-    2.14      16.6 +/-    2.14  0.080 / 0.160
G21     98.5           70.7               11.4 +/-    0.94      12.0 +/-    0.94  0.070 / 0.120
G24     101.6          25.5               11.5 +/-    1.14      22.2 +/-    1.14  0.090 / 0.120
G27     301.9          33.9                7.9 +/-    1.93      12.8 +/-    1.93  0.030 / 0.030
G32     210.0          28.5               13.3 +/-    1.06      24.0 +/-    1.06  0.030 / 0.030