PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/17-20:27:50
G02     88.8           11.0                9.3 +/-    3.11      25.5 +/-    3.11  0.050 / 0.140
G05     45.7           26.1                7.4 +/-    2.53      14.2 +/-    2.53  0.060 / 0.110
G13     87.5           34.7                9.8 +/-    1.90      15.7 +/-    1.90  0.080 / 0.110
G15     137.9          45.0               11.3 +/-    1.64      15.2 +/-    1.64  0.100 / 0.110
G20     240.1          29.5               11.6 +/-    1.96      20.5 +/-    1.96  0.030 / 0.060
G21     303.8          39.8                9.2 +/-    0.87      13.5 +/-    0.87  0.030 / 0.050
G25     205.3          19.9               11.9 +/-    1.64      26.2 +/-    1.64  0.100 / 0.300
G26     297.8          19.8                8.0 +/-    1.32      17.7 +/-    1.32  0.120 / 0.300
G29     129.5          83.6                9.3 +/-    0.36       9.3 +/-    0.36  0.150 / 0.200