PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-16:57:40
G02     215.5          56.8               15.3 +/-    0.73      17.8 +/-    0.73  0.040 / 0.100
G06     60.5           75.3               14.0 +/-    0.57      14.4 +/-    0.57  0.060 / 0.090
G12     318.7          35.9               12.1 +/-    1.87      18.9 +/-    1.87  0.050 / 0.090
G17     58.8           30.4               12.0 +/-    0.67      20.9 +/-    0.67  0.050 / 0.110
G19     41.3           47.9               13.3 +/-    0.60      17.2 +/-    0.60  0.050 / 0.080
G24     268.8          41.6               13.7 +/-    0.92      19.4 +/-    0.92  0.070 / 0.090
G28     122.6          13.6               14.3 +/-    1.01      36.9 +/-    1.01  0.030 / 0.040