PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-14:58:10
G10     267.9          38.2                6.9 +/-    1.42      10.4 +/-    1.42  0.140 / 0.280
G13     41.9           18.5                3.8 +/-    2.76       8.8 +/-    2.76  0.180 / 0.220
G15     57.0           46.5                5.9 +/-    0.63       7.8 +/-    0.63  0.050 / 0.040
G16     281.5          11.0                5.6 +/-    1.05      15.2 +/-    1.05  0.040 / 0.050
G18     307.9          65.9                5.9 +/-    0.69       6.4 +/-    0.69  0.350 / 0.240
G20     53.5           37.1                4.6 +/-    0.94       7.0 +/-    0.94  0.180 / 0.180
G21     21.7           73.9                5.7 +/-    1.17       5.9 +/-    1.17  0.050 / 0.060
G24     120.5          14.6                9.1 +/-    1.89      22.9 +/-    1.89  0.060 / 0.090
G27     317.5          20.8                4.2 +/-    2.91       9.1 +/-    2.91  0.210 / 0.280
G29     166.6          26.8                6.8 +/-    1.13      12.8 +/-    1.13  0.120 / 0.210