PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/13-23:57:50
G02     297.5          81.8                9.3 +/-    0.51       9.4 +/-    0.51  0.030 / 0.040
G05     166.8          26.2               14.1 +/-    2.31      26.8 +/-    2.31  0.030 / 0.050
G06     40.2           47.6                8.8 +/-    0.93      11.4 +/-    0.93  0.040 / 0.120
G12     319.5          63.0                9.5 +/-    0.94      10.6 +/-    0.94  0.050 / 0.130
G17     77.9           19.1                9.2 +/-    0.90      20.8 +/-    0.90  0.120 / 0.320
G19     66.3           33.6                9.5 +/-    0.60      15.5 +/-    0.60  0.110 / 0.380
G24     235.1          28.4               13.7 +/-    1.89      24.8 +/-    1.89  0.040 / 0.040
G25     317.8          20.5                8.5 +/-    2.77      18.5 +/-    2.77  0.030 / 0.040