PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-22:27:30
G02     49.7           42.3                9.2 +/-    1.14      12.9 +/-    1.14  0.060 / 0.050
G05     83.3           69.8               10.7 +/-    0.41      11.3 +/-    0.41  0.040 / 0.050
G12     185.9          41.1               11.1 +/-    1.27      15.8 +/-    1.27  0.130 / 0.500
G20     202.5          51.6               12.0 +/-    1.08      14.9 +/-    1.08  0.150 / 0.510
G21     263.7          11.5               10.0 +/-    6.20      27.0 +/-    6.20  0.030 / 0.060
G25     243.8          57.1               12.2 +/-    1.01      14.2 +/-    1.01  0.040 / 0.060
G29     323.2          47.6               10.8 +/-    0.80      14.0 +/-    0.80  0.040 / 0.080