PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-15:57:50
G10     272.8          40.9                7.1 +/-    1.21      10.2 +/-    1.21  0.090 / 0.120
G13     40.1           15.1                6.2 +/-    2.27      15.4 +/-    2.27  0.120 / 0.120
G15     53.4           43.0                7.5 +/-    0.98      10.4 +/-    0.98  0.050 / 0.100
G18     318.1          66.8                8.0 +/-    0.69       8.6 +/-    0.69  0.060 / 0.100
G20     57.0           33.3                5.2 +/-    1.95       8.5 +/-    1.95  0.120 / 0.200
G21     40.7           75.1                6.4 +/-    0.65       6.6 +/-    0.65  0.150 / 0.150
G24     116.8          17.2               11.5 +/-    1.55      27.1 +/-    1.55  0.350 / 0.210
G27     315.0          24.1                4.6 +/-    1.67       9.1 +/-    1.67  0.370 / 0.410
G29     166.7          21.8                8.5 +/-    0.90      17.9 +/-    0.90  0.260 / 0.450
G32     205.6          13.5                9.2 +/-    2.43      23.8 +/-    2.43  0.100 / 0.350