PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-15:12:40
G01     41.1           15.9                8.1 +/-    1.41      19.8 +/-    1.41  0.080 / 0.120
G06     175.1          39.4               14.7 +/-    1.84      21.6 +/-    1.84  0.060 / 0.140
G13     239.5          22.0               10.8 +/-    1.94      22.7 +/-    1.94  0.120 / 0.180
G15     273.1          12.3                8.1 +/-    0.76      21.5 +/-    0.76  0.160 / 0.230
G17     8.7            68.5               12.2 +/-    0.89      13.0 +/-    0.89  0.090 / 0.360
G19     283.5          70.8               12.0 +/-    0.68      12.6 +/-    0.68  0.120 / 0.290
G24     317.2          17.9                8.0 +/-    1.81      18.5 +/-    1.81  0.030 / 0.030
G28     72.4           46.5                9.9 +/-    0.94      13.1 +/-    0.94  0.030 / 0.030
G30     155.0          29.1               11.7 +/-    0.72      20.9 +/-    0.72  0.130 / 0.220