PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-15:13:10
G10     261.6          34.2                5.5 +/-    2.02       8.9 +/-    2.02  0.110 / 0.210
G13     45.1           23.1                5.2 +/-    2.75      10.6 +/-    2.75  0.320 / 0.180
G15     63.9           50.9                7.1 +/-    1.14       8.8 +/-    1.14  0.370 / 0.300
G18     293.9          63.9                7.1 +/-    0.75       7.8 +/-    0.75  0.340 / 0.470
G20     49.2           41.6                5.6 +/-    0.67       8.0 +/-    0.67  0.050 / 0.070
G21     5.3            71.0                5.7 +/-    0.34       6.0 +/-    0.34  0.050 / 0.070
G24     125.5          10.9              -12.0 +/-   27.78     -32.9 +/-   27.78  0.140 / 0.210
G27     320.1          16.0                3.8 +/-    2.15       9.3 +/-    2.15  0.110 / 0.190
G29     165.6          32.9                8.1 +/-    0.74      13.4 +/-    0.74  0.070 / 0.110