PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-17:28:00
G01     39.4           13.0                7.9 +/-    1.69      20.7 +/-    1.69  0.100 / 0.280
G06     173.5          43.9               14.3 +/-    0.72      19.6 +/-    0.72  0.100 / 0.270
G13     236.1          19.5               12.6 +/-    3.61      28.0 +/-    3.61  0.090 / 0.130
G15     271.1          10.9               10.9 +/-    0.79      29.7 +/-    0.79  0.070 / 0.140
G17     14.3           65.5               11.9 +/-    0.67      12.9 +/-    0.67  0.340 / 0.300
G19     296.8          72.0               12.4 +/-    1.14      13.0 +/-    1.14  0.190 / 0.300
G24     316.0          21.0                9.8 +/-    2.10      21.1 +/-    2.10  0.380 / 0.440
G28     77.0           44.8               11.5 +/-    1.85      15.5 +/-    1.85  0.520 / 0.400
G30     156.0          25.9               11.7 +/-    2.36      22.5 +/-    2.36  0.030 / 0.030