PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-17:57:30
G02     250.9          76.8               12.2 +/-    0.72      12.5 +/-    0.72  0.090 / 0.110
G05     173.7          17.0               19.1 +/-    2.34      45.4 +/-    2.34  0.090 / 0.100
G06     40.2           54.0               10.4 +/-    0.75      12.5 +/-    0.75  0.050 / 0.050
G12     321.4          57.2               11.3 +/-    1.18      13.1 +/-    1.18  0.030 / 0.050
G17     76.3           17.2                9.9 +/-    0.85      23.3 +/-    0.85  0.100 / 0.320
G19     63.5           34.1               10.4 +/-    1.14      16.8 +/-    1.14  0.170 / 0.320
G24     242.6          32.6               14.5 +/-    1.62      24.1 +/-    1.62  0.090 / 0.150
G25     317.5          20.3               11.3 +/-    3.04      24.7 +/-    3.04  0.050 / 0.130