PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-21:42:50
G01     250.6          35.0                9.2 +/-    1.82      14.6 +/-    1.82  0.040 / 0.030
G03     315.8          44.3                7.8 +/-    0.91      10.7 +/-    0.91  0.030 / 0.040
G11     237.5          12.6                7.8 +/-    2.87      20.4 +/-    2.87  0.070 / 0.330
G14     60.9           40.5                6.3 +/-    1.27       9.1 +/-    1.27  0.130 / 0.270
G22     304.5          65.9                8.1 +/-    0.54       8.8 +/-    0.54  0.030 / 0.030
G23     286.7          19.1                8.5 +/-    1.81      19.2 +/-    1.81  0.030 / 0.030
G25     39.4           9.9                 6.1 +/-    2.40      17.0 +/-    2.40  0.120 / 0.110
G26     137.9          37.8               11.4 +/-    0.66      17.3 +/-    0.66  0.070 / 0.140
G31     40.3           59.9                7.3 +/-    0.71       8.3 +/-    0.71  0.060 / 0.080
G32     77.4           23.3                7.5 +/-    1.62      15.2 +/-    1.62  0.070 / 0.090