PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/30-13:58:00
G10     243.3          19.5                3.5 +/-    2.43       7.9 +/-    2.43  0.140 / 0.140
G13     64.0           35.0                4.7 +/-    1.08       7.4 +/-    1.08  0.160 / 0.140
G15     102.4          56.6                5.1 +/-    0.69       6.0 +/-    0.69  0.100 / 0.320
G16     307.9          13.3                3.3 +/-    2.00       8.5 +/-    2.00  0.190 / 0.420
G18     258.2          52.1                6.1 +/-    2.51       7.5 +/-    2.51  0.040 / 0.030
G20     32.5           59.9                3.8 +/-    0.64       4.4 +/-    0.64  0.060 / 0.040
G21     328.7          57.4                2.6 +/-    0.34       3.0 +/-    0.34  0.090 / 0.250
G26     278.6          18.3                5.0 +/-    0.96      11.4 +/-    0.96  0.100 / 0.320
G29     159.7          56.6                5.3 +/-    0.72       6.2 +/-    0.72  0.080 / 0.070