PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-22:57:10
G02     223.1          67.7               12.9 +/-    0.77      13.9 +/-    0.77  0.030 / 0.050
G06     46.1           67.3               12.2 +/-    0.48      13.1 +/-    0.48  0.050 / 0.050
G12     320.6          43.1                9.7 +/-    0.67      13.5 +/-    0.67  0.050 / 0.090
G17     61.4           30.7                9.5 +/-    2.13      16.5 +/-    2.13  0.100 / 0.120
G19     45.7           45.9               11.5 +/-    0.77      15.3 +/-    0.77  0.030 / 0.030
G24     256.1          39.5               14.0 +/-    2.36      20.5 +/-    2.36  0.030 / 0.030