PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:57:50
G02     62.9           31.0               11.5 +/-    1.03      19.7 +/-    1.03  0.220 / 0.310
G05     55.0           61.5               14.4 +/-    0.33      16.1 +/-    0.33  0.160 / 0.290
G12     183.8          26.5               16.8 +/-    1.14      31.8 +/-    1.14  0.080 / 0.120
G13     125.7          18.7               16.3 +/-    1.49      37.0 +/-    1.49  0.110 / 0.150
G15     162.0          15.4               19.8 +/-    1.62      48.7 +/-    1.62  0.090 / 0.110
G20     210.3          67.2               15.7 +/-    0.93      16.9 +/-    0.93  0.110 / 0.090
G21     275.4          20.9               15.4 +/-    2.00      33.1 +/-    2.00  0.030 / 0.050
G25     223.3          46.4               15.5 +/-    2.95      20.5 +/-    2.95  0.030 / 0.040
G29     334.3          62.3               15.1 +/-    0.43      16.8 +/-    0.43  0.020 / 0.030