PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-16:57:50
G08     318.7          12.7                6.4 +/-    2.11      16.8 +/-    2.11  0.060 / 0.070
G10     309.6          55.2                7.6 +/-    0.72       9.1 +/-    0.72  0.070 / 0.080
G14     212.9          19.7                8.1 +/-    1.80      17.9 +/-    1.80  0.030 / 0.050
G15     45.4           19.5                6.2 +/-    0.58      13.8 +/-    0.58  0.040 / 0.050
G18     20.8           63.1                8.2 +/-    0.39       9.0 +/-    0.39  0.080 / 0.110
G20     76.6           15.0                8.1 +/-    1.59      20.1 +/-    1.59  0.070 / 0.110
G21     120.5          62.4                9.5 +/-    0.87      10.6 +/-    0.87  0.070 / 0.270
G24     89.3           29.3               10.7 +/-    0.96      19.0 +/-    0.96  0.090 / 0.230
G27     289.0          37.5                5.4 +/-    0.76       8.2 +/-    0.76  0.050 / 0.070
G32     215.1          39.6                9.7 +/-    1.60      14.2 +/-    1.60  0.040 / 0.070