PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/22-14:42:50
G10     247.5          23.4                4.9 +/-    1.19       9.9 +/-    1.19  0.030 / 0.040
G13     58.0           32.8                4.3 +/-    0.97       7.1 +/-    0.97  0.030 / 0.040
G15     91.2           57.0                7.0 +/-    0.67       8.1 +/-    0.67  0.150 / 0.170
G16     303.0          13.8                1.8 +/-    1.48       4.7 +/-    1.48  0.410 / 0.260
G18     265.7          55.6                4.7 +/-    2.08       5.6 +/-    2.08  0.070 / 0.100
G20     37.4           54.7                4.8 +/-    0.92       5.7 +/-    0.92  0.060 / 0.090
G21     336.4          61.3                3.8 +/-    0.56       4.3 +/-    0.56  0.100 / 0.250
G26     273.5          16.7                5.3 +/-    1.87      12.7 +/-    1.87  0.110 / 0.260
G29     161.7          50.0                7.1 +/-    0.64       9.0 +/-    0.64  0.030 / 0.030