PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/31-21:28:00
G02     65.0           29.1                8.5 +/-    1.68      15.2 +/-    1.68  0.030 / 0.040
G05     50.1           54.2                8.6 +/-    0.76      10.3 +/-    0.76  0.050 / 0.040
G12     180.7          21.7               11.5 +/-    2.24      24.3 +/-    2.24  0.510 / 0.470
G13     121.5          20.5                9.7 +/-    1.11      21.1 +/-    1.11  0.160 / 0.310
G15     161.8          17.2               12.2 +/-    1.43      28.7 +/-    1.43  0.100 / 0.240
G21     277.3          21.2                9.6 +/-    1.75      20.6 +/-    1.75  0.070 / 0.230
G25     225.8          45.7               10.0 +/-    2.61      13.3 +/-    2.61  0.130 / 0.210
G29     332.3          61.0                9.6 +/-    0.58      10.8 +/-    0.58  0.130 / 0.180