PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-17:12:30
G02     201.8          19.5               13.9 +/-    1.80      30.9 +/-    1.80  0.070 / 0.150
G06     169.3          56.7               14.4 +/-    0.82      16.9 +/-    0.82  0.070 / 0.110
G13     227.2          11.8               12.5 +/-    4.23      33.6 +/-    4.23  0.120 / 0.280
G17     27.9           55.9               10.0 +/-    0.82      11.8 +/-    0.82  0.130 / 0.360
G19     338.0          70.5               11.3 +/-    0.68      11.9 +/-    0.68  0.040 / 0.040
G24     309.8          29.8               10.1 +/-    2.20      17.8 +/-    2.20  0.030 / 0.050
G28     90.9           38.2               10.7 +/-    0.64      16.0 +/-    0.64  0.080 / 0.520
G30     158.0          14.5               12.2 +/-    3.62      30.8 +/-    3.62  0.090 / 0.440