PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-18:12:30
G02     39.0           50.8               14.9 +/-    0.46      18.6 +/-    0.46  0.030 / 0.050
G05     136.3          66.6               16.3 +/-    0.49      17.6 +/-    0.49  0.030 / 0.040
G06     58.0           11.3               12.8 +/-    1.76      34.8 +/-    1.76  0.040 / 0.050
G12     193.3          59.6               18.2 +/-    0.90      20.7 +/-    0.90  0.050 / 0.040
G20     199.2          34.3               20.2 +/-    0.78      32.5 +/-    0.78  0.140 / 0.340
G25     279.1          59.3               16.9 +/-    1.12      19.3 +/-    1.12  0.160 / 0.310
G29     314.3          36.8               15.2 +/-    1.34      23.4 +/-    1.34  0.030 / 0.040