PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-22:27:50
G01     231.6          22.0                9.0 +/-    1.98      18.9 +/-    1.98  0.030 / 0.030
G03     300.9          62.9                7.0 +/-    0.51       7.8 +/-    0.51  0.030 / 0.030
G14     80.5           28.3                8.4 +/-    1.26      15.3 +/-    1.26  0.070 / 0.080
G16     155.8          36.3               10.9 +/-    0.97      16.9 +/-    0.97  0.050 / 0.070
G22     241.5          74.9                8.1 +/-    0.42       8.4 +/-    0.42  0.040 / 0.050
G23     301.8          31.9                7.6 +/-    1.68      12.9 +/-    1.68  0.060 / 0.050
G26     113.0          52.2                9.4 +/-    0.76      11.5 +/-    0.76  0.150 / 0.200
G31     42.2           40.1                6.5 +/-    1.27       9.4 +/-    1.27  0.140 / 0.210
G32     93.8           10.9                9.1 +/-    1.61      24.8 +/-    1.61  0.080 / 0.530