PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-22:42:30
G03     241.2          68.6                8.1 +/-    0.96       8.6 +/-    0.96  0.040 / 0.040
G09     302.5          16.6                8.0 +/-    1.31      19.0 +/-    1.31  0.030 / 0.040
G14     98.9           15.2                8.4 +/-    1.37      20.8 +/-    1.37  0.030 / 0.040
G16     135.1          57.5               12.1 +/-    0.64      14.1 +/-    0.64  0.030 / 0.050
G22     196.6          57.2                9.2 +/-    0.34      10.7 +/-    0.34  0.140 / 0.190
G23     318.0          47.7                8.1 +/-    1.06      10.5 +/-    1.06  0.150 / 0.250
G26     72.9           53.3                7.8 +/-    1.02       9.5 +/-    1.02  0.150 / 0.250
G31     51.1           21.8                7.2 +/-    2.29      15.2 +/-    2.29  0.210 / 0.300