PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-16:42:50
G01     40.2           14.4                7.8 +/-    0.72      19.6 +/-    0.72  0.150 / 0.280
G06     174.2          41.8               14.3 +/-    1.05      20.1 +/-    1.05  0.140 / 0.340
G13     237.7          20.8               12.9 +/-    1.31      27.9 +/-    1.31  0.130 / 0.180
G15     272.3          11.6               12.0 +/-    1.42      32.4 +/-    1.42  0.110 / 0.200
G17     11.7           67.0               10.2 +/-    0.69      11.0 +/-    0.69  0.060 / 0.160
G19     290.1          71.5               10.8 +/-    0.30      11.3 +/-    0.30  0.070 / 0.140
G24     316.6          19.5                9.9 +/-    3.41      22.0 +/-    3.41  0.030 / 0.030
G28     74.7           45.7               10.9 +/-    0.48      14.6 +/-    0.48  0.030 / 0.030
G30     155.5          27.6               13.0 +/-    1.07      23.9 +/-    1.07  0.070 / 0.250