PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-12:42:40
G02     65.0           27.4                3.7 +/-    0.79       6.9 +/-    0.79  0.020 / 0.040
G05     52.2           56.6                3.5 +/-    0.34       4.1 +/-    0.34  0.020 / 0.040
G12     185.2          28.2                5.1 +/-    2.03       9.3 +/-    2.03  0.080 / 0.180
G13     125.1          18.7                5.6 +/-    1.73      12.7 +/-    1.73  0.090 / 0.210
G15     159.6          17.0                6.0 +/-    2.11      14.2 +/-    2.11  0.040 / 0.050
G20     212.9          63.0                8.0 +/-    0.61       8.9 +/-    0.61  0.040 / 0.040
G21     277.6          25.0                2.3 +/-    1.21       4.4 +/-    1.21  0.080 / 0.120
G25     229.5          47.7                6.5 +/-    1.59       8.4 +/-    1.59  0.100 / 0.100
G29     336.1          63.6                1.9 +/-    0.61       2.1 +/-    0.61  0.060 / 0.060