PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-21:42:40
G01     236.2          25.8                8.8 +/-    1.95      16.9 +/-    1.95  0.030 / 0.020
G03     307.7          58.5                7.2 +/-    0.97       8.3 +/-    0.97  0.030 / 0.030
G14     75.3           31.8                7.1 +/-    2.28      12.0 +/-    2.28  0.100 / 0.130
G16     158.4          31.0               10.7 +/-    1.75      18.4 +/-    1.75  0.070 / 0.100
G22     264.6          75.4                7.2 +/-    0.34       7.5 +/-    0.34  0.050 / 0.040
G23     297.8          28.5                7.2 +/-    1.76      13.1 +/-    1.76  0.060 / 0.050
G26     120.9          49.1                9.8 +/-    0.65      12.6 +/-    0.65  0.150 / 0.240
G31     40.9           44.9                6.8 +/-    1.05       9.2 +/-    1.05  0.140 / 0.250
G32     89.6           14.1                8.0 +/-    2.47      20.3 +/-    2.47  0.070 / 0.130