PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-23:13:00
G02     252.1          78.5                8.1 +/-    0.47       8.2 +/-    0.47  0.060 / 0.040
G05     169.8          19.4               12.9 +/-    1.36      28.9 +/-    1.36  0.050 / 0.040
G06     40.3           54.8                8.7 +/-    0.59      10.4 +/-    0.59  0.080 / 0.130
G12     321.6          55.6                8.8 +/-    0.76      10.4 +/-    0.76  0.090 / 0.130
G17     71.9           23.1                8.2 +/-    1.50      16.6 +/-    1.50  0.060 / 0.040
G19     58.8           38.2                9.2 +/-    1.06      13.8 +/-    1.06  0.060 / 0.030
G24     242.0          33.1               11.7 +/-    1.25      19.2 +/-    1.25  0.110 / 0.170
G25     317.1          14.1                7.4 +/-    1.96      18.9 +/-    1.96  0.110 / 0.150