PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/18-09:13:10
G10     256.5          30.9                5.5 +/-    1.95       9.4 +/-    1.95  0.090 / 0.270
G13     48.5           26.4                3.9 +/-    2.57       7.4 +/-    2.57  0.080 / 0.210
G15     72.1           54.3                6.5 +/-    0.47       7.8 +/-    0.47  0.040 / 0.040
G16     289.6          14.5                3.6 +/-    1.41       9.1 +/-    1.41  0.040 / 0.040
G20     37.7           54.2                4.6 +/-    0.80       5.5 +/-    0.80  0.040 / 0.040
G21     344.8          65.6                4.6 +/-    0.62       5.0 +/-    0.62  0.040 / 0.040
G26     261.1          12.8                5.1 +/-    1.56      13.4 +/-    1.56  0.220 / 0.200
G27     321.9          11.2              -11.1 +/-   15.80     -30.1 +/-   15.80  0.140 / 0.190
G29     166.1          41.7                7.2 +/-    0.70      10.2 +/-    0.70  0.140 / 0.170