PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/31-22:12:40
G01     220.6          11.3               10.0 +/-    1.41      27.2 +/-    1.41  0.030 / 0.040
G03     260.2          70.2                8.1 +/-    0.91       8.5 +/-    0.91  0.030 / 0.040
G09     298.8          12.3                7.9 +/-    6.88      20.9 +/-    6.88  0.040 / 0.050
G14     93.8           19.2                8.2 +/-    2.27      18.4 +/-    2.27  0.040 / 0.050
G16     142.8          52.0               11.6 +/-    0.49      14.3 +/-    0.49  0.050 / 0.170
G22     202.5          63.4                9.2 +/-    0.31      10.1 +/-    0.31  0.140 / 0.130
G23     313.4          43.1                7.8 +/-    0.94      10.9 +/-    0.94  0.320 / 0.320
G26     83.6           54.9                8.2 +/-    0.59       9.8 +/-    0.59  0.280 / 0.380
G31     48.2           26.4                5.6 +/-    2.14      10.5 +/-    2.14  0.110 / 0.240