PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/18-20:12:30
G02     64.1           30.1                7.2 +/-    1.49      12.6 +/-    1.49  0.040 / 0.030
G05     50.7           55.2                9.0 +/-    0.58      10.7 +/-    0.58  0.040 / 0.040
G12     180.3          21.8               13.1 +/-    1.45      27.7 +/-    1.45  0.220 / 0.470
G13     121.9          20.1               12.9 +/-    1.91      28.3 +/-    1.91  0.480 / 0.380
G15     162.7          16.4               15.6 +/-    2.02      37.6 +/-    2.02  0.120 / 0.210
G21     276.8          20.7                9.7 +/-    1.24      20.9 +/-    1.24  0.090 / 0.170
G25     226.0          46.1               10.6 +/-    2.33      14.1 +/-    2.33  0.100 / 0.090
G29     331.9          60.3                8.6 +/-    0.45       9.8 +/-    0.45  0.110 / 0.090