PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-18:12:30
G08     288.2          22.8                7.9 +/-    0.96      16.3 +/-    0.96  0.080 / 0.090
G10     17.3           63.2               11.8 +/-    0.47      13.0 +/-    0.47  0.090 / 0.110
G14     235.2          51.0               10.8 +/-    1.73      13.5 +/-    1.73  0.110 / 0.210
G18     71.5           46.9               11.0 +/-    0.75      14.4 +/-    0.75  0.080 / 0.260
G21     147.5          29.9               13.2 +/-    1.20      23.1 +/-    1.20  0.030 / 0.020
G24     52.5           24.0                9.0 +/-    2.08      17.9 +/-    2.08  0.030 / 0.030
G27     247.7          28.6                9.3 +/-    2.04      16.8 +/-    2.04  0.100 / 0.080
G32     257.4          70.8               10.6 +/-    0.81      11.1 +/-    0.81  0.110 / 0.070