PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-23:12:50
G02     252.1          78.5                8.6 +/-    0.60       8.8 +/-    0.60  0.100 / 0.130
G05     169.8          19.4               15.3 +/-    2.71      34.3 +/-    2.71  0.100 / 0.120
G06     40.3           54.8                8.6 +/-    0.75      10.2 +/-    0.75  0.060 / 0.050
G12     321.6          55.6                8.5 +/-    1.69      10.0 +/-    1.69  0.040 / 0.050
G17     71.9           23.1                8.9 +/-    1.04      18.2 +/-    1.04  0.060 / 0.200
G19     58.8           38.2                8.8 +/-    0.89      13.2 +/-    0.89  0.080 / 0.230
G24     242.0          33.1               12.8 +/-    0.64      21.1 +/-    0.64  0.090 / 0.270
G25     317.1          14.1                8.2 +/-    1.82      20.9 +/-    1.82  0.120 / 0.400