PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/11-18:12:40
G02     228.0          67.7               12.4 +/-    0.71      13.3 +/-    0.71  0.050 / 0.040
G06     43.2           63.8                6.6 +/-   13.38       7.3 +/-   13.38  0.050 / 0.040
G12     321.6          47.5                9.8 +/-    0.82      12.7 +/-    0.82  0.040 / 0.040
G17     68.4           23.1               11.2 +/-    6.93      22.8 +/-    6.93  0.040 / 0.040
G19     53.8           40.2                2.9 +/-   32.37       4.2 +/-   32.37  0.200 / 0.270
G24     253.4          37.9                9.4 +/-    6.69      14.2 +/-    6.69  0.170 / 0.360
G25     315.9          12.2                7.8 +/-   23.90      20.8 +/-   23.90  0.100 / 0.080