PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/15-11:27:50
G02     32.0           56.8                6.2 +/-    0.92       7.3 +/-    0.92  0.020 / 0.030
G05     145.4          58.9               11.2 +/-    0.53      12.8 +/-    0.53  0.020 / 0.030
G06     50.4           23.5                4.0 +/-    2.33       8.1 +/-    2.33  0.020 / 0.030
G12     210.3          72.4                8.8 +/-    0.75       9.2 +/-    0.75  0.030 / 0.030
G19     97.9           10.9                5.8 +/-    1.28      15.7 +/-    1.28  0.090 / 0.150
G20     199.2          20.6                7.2 +/-    1.51      15.6 +/-    1.51  0.110 / 0.250
G25     301.6          51.3                7.8 +/-    2.36       9.7 +/-    2.36  0.040 / 0.050
G29     306.8          28.9                5.1 +/-    0.75       9.1 +/-    0.75  0.070 / 0.050