PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/27-17:27:50
G02     44.1           46.2               18.4 +/-    0.69      24.4 +/-    0.69  0.040 / 0.040
G05     119.1          70.0               21.6 +/-    0.58      22.9 +/-    0.58  0.040 / 0.040
G12     190.9          53.7               21.8 +/-    0.43      26.3 +/-    0.43  0.060 / 0.030
G20     200.6          39.6               24.9 +/-    0.50      36.4 +/-    0.50  0.050 / 0.040
G25     268.1          59.6               17.0 +/-    2.42      19.4 +/-    2.42  0.050 / 0.080
G29     318.6          41.9               13.9 +/-    1.60      19.6 +/-    1.60  0.060 / 0.090