PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-18:13:10
G01     319.3          17.6               10.1 +/-    1.70      23.5 +/-    1.70  0.180 / 0.260
G08     255.8          13.5                8.9 +/-    2.38      22.9 +/-    2.38  0.150 / 0.200
G10     79.3           52.8               10.8 +/-    0.97      13.2 +/-    0.97  0.050 / 0.040
G11     302.5          23.7                8.5 +/-    1.30      17.0 +/-    1.30  0.050 / 0.040
G14     296.7          71.1                9.4 +/-    0.95       9.9 +/-    0.95  0.030 / 0.030
G18     302.9          42.9                9.7 +/-    1.76      13.5 +/-    1.76  0.040 / 0.040
G20     105.0          29.3               11.9 +/-    0.94      21.1 +/-    0.94  0.070 / 0.160
G31     179.5          37.9               12.6 +/-    0.73      19.0 +/-    0.73  0.070 / 0.150
G32     3.7            68.6                9.9 +/-    0.27      10.6 +/-    0.27  0.140 / 0.310