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               13.8 +/-    0.93      17.3 +/-    0.93  0.040 / 0.040
G05     136.3          66.6               16.7 +/-    0.51      18.0 +/-    0.51  0.050 / 0.050
G06     58.0           11.3               12.2 +/-    2.89      33.1 +/-    2.89  0.040 / 0.030
G12     193.3          59.6               18.5 +/-    0.37      21.0 +/-    0.37  0.030 / 0.040
G20     199.2          34.3               19.9 +/-    1.23      31.9 +/-    1.23  0.030 / 0.030
G25     279.1          59.3               17.2 +/-    1.34      19.6 +/-    1.34  0.030 / 0.030
G29     314.3          36.8               14.1 +/-    0.76      21.7 +/-    0.76  0.050 / 0.070