PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-16:57:50
G02     67.6           25.9               13.0 +/-    1.09      24.8 +/-    1.09  0.030 / 0.040
G05     49.9           55.3               12.1 +/-    0.65      14.4 +/-    0.65  0.030 / 0.040
G12     183.9          23.4               13.6 +/-    2.07      27.6 +/-    2.07  0.110 / 0.200
G13     122.0          21.6               17.9 +/-    1.05      37.9 +/-    1.05  0.070 / 0.200
G15     158.0          19.9               16.6 +/-    4.76      36.7 +/-    4.76  0.040 / 0.070
G20     215.3          70.1               16.6 +/-    0.69      17.5 +/-    0.69  0.040 / 0.110
G21     279.9          25.3               13.0 +/-    1.18      25.3 +/-    1.18  0.040 / 0.050
G25     222.5          43.6               14.1 +/-    1.19      19.4 +/-    1.19  0.040 / 0.040
G29     342.7          69.4               12.4 +/-    1.36      13.2 +/-    1.36  0.090 / 0.190