PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/18-15:27:40
G02     31.5           57.2                8.8 +/-    0.43      10.2 +/-    0.43  0.030 / 0.040
G05     148.5          58.8               12.2 +/-    0.70      14.0 +/-    0.70  0.040 / 0.040
G06     52.1           19.7                6.9 +/-    0.67      15.3 +/-    0.67  0.100 / 0.240
G12     205.8          70.8               10.2 +/-    1.18      10.7 +/-    1.18  0.100 / 0.200
G20     198.4          23.6               10.6 +/-    0.93      21.5 +/-    0.93  0.030 / 0.040
G25     298.4          53.6               10.0 +/-    0.85      12.1 +/-    0.85  0.030 / 0.040
G29     308.4          31.0                7.7 +/-    1.04      13.2 +/-    1.04  0.070 / 0.170