PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-17:43:10
G02     201.8          18.3               13.4 +/-    1.13      30.7 +/-    1.13  0.170 / 0.660
G06     169.5          56.0               12.6 +/-    1.20      14.8 +/-    1.20  0.110 / 0.590
G13     227.7          12.3               12.6 +/-    4.15      33.4 +/-    4.15  0.110 / 0.210
G17     27.1           56.6                9.3 +/-    0.47      10.9 +/-    0.47  0.120 / 0.190
G19     335.7          70.8               10.6 +/-    0.53      11.1 +/-    0.53  0.030 / 0.040
G24     310.4          29.3                8.7 +/-    1.81      15.4 +/-    1.81  0.020 / 0.050
G28     90.0           38.7               10.5 +/-    0.61      15.6 +/-    0.61  0.080 / 0.150
G30     157.9          15.3               10.9 +/-    3.52      26.9 +/-    3.52  0.070 / 0.160