PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-16:57:50
G02     248.1          75.6                7.7 +/-    0.51       7.9 +/-    0.51  0.130 / 0.150
G05     171.0          18.7                9.1 +/-    2.41      20.8 +/-    2.41  0.090 / 0.130
G06     40.5           52.6                7.9 +/-    0.46       9.6 +/-    0.46  0.070 / 0.110
G12     322.7          60.6                7.1 +/-    0.84       8.0 +/-    0.84  0.080 / 0.090
G17     74.4           19.0                6.7 +/-    1.94      15.2 +/-    1.94  0.030 / 0.040
G19     57.7           39.5                7.9 +/-    1.18      11.6 +/-    1.18  0.030 / 0.040
G24     239.7          32.6                9.4 +/-    0.84      15.6 +/-    0.84  0.330 / 0.280
G25     317.2          16.0                6.3 +/-    2.20      15.3 +/-    2.20  0.390 / 0.300