PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-21:27:20
G02     200.9          25.8               18.0 +/-    1.85      34.6 +/-    1.85  0.150 / 0.140
G06     167.2          59.8               16.6 +/-    0.55      18.9 +/-    0.55  0.100 / 0.130
G17     22.9           58.6               14.0 +/-    0.66      16.0 +/-    0.66  0.040 / 0.040
G19     332.9          69.8               13.7 +/-    0.81      14.5 +/-    0.81  0.040 / 0.040
G24     306.5          33.0               12.2 +/-    1.71      20.0 +/-    1.71  0.040 / 0.110
G28     93.3           36.8               14.4 +/-    0.91      22.2 +/-    0.91  0.050 / 0.070