PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-14:27:40
G10     251.1          26.5                5.0 +/-    1.48       9.5 +/-    1.48  0.050 / 0.040
G13     53.8           30.5                5.5 +/-    1.82       9.5 +/-    1.82  0.050 / 0.050
G15     82.6           56.3                6.8 +/-    0.75       8.0 +/-    0.75  0.110 / 0.280
G16     298.6          14.0                1.7 +/-    1.69       4.2 +/-    1.69  0.120 / 0.190
G18     272.5          58.3                5.7 +/-    1.13       6.5 +/-    1.13  0.080 / 0.120
G20     40.5           51.2                5.4 +/-    0.61       6.7 +/-    0.61  0.080 / 0.140
G21     342.1          63.9                4.5 +/-    0.34       5.0 +/-    0.34  0.090 / 0.320
G26     269.1          15.2                3.8 +/-    0.95       9.5 +/-    0.95  0.080 / 0.350
G29     163.2          45.5                7.9 +/-    0.47      10.6 +/-    0.47  0.050 / 0.040