PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/30-16:42:30
G02     31.3           57.3               13.1 +/-    0.51      15.3 +/-    0.51  0.030 / 0.040
G05     149.5          58.9               16.3 +/-    0.52      18.7 +/-    0.52  0.030 / 0.040
G06     52.6           18.5               11.1 +/-    0.62      25.3 +/-    0.62  0.040 / 0.060
G12     203.7          69.9               13.4 +/-    1.30      14.2 +/-    1.30  0.060 / 0.040
G20     198.2          24.7               16.1 +/-    1.71      31.7 +/-    1.71  0.030 / 0.030
G25     296.9          54.6               14.6 +/-    0.97      17.5 +/-    0.97  0.030 / 0.050
G29     308.3          30.6               12.3 +/-    1.62      21.3 +/-    1.62  0.080 / 0.130