PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-21:27:40
G02     26.2           60.8               11.6 +/-    0.76      13.1 +/-    0.76  0.070 / 0.050
G05     148.9          58.7               14.4 +/-    0.39      16.6 +/-    0.39  0.040 / 0.050
G06     53.0           17.1                9.1 +/-    2.28      21.4 +/-    2.28  0.030 / 0.030
G12     199.0          69.1               13.8 +/-    0.34      14.7 +/-    0.34  0.030 / 0.030
G19     99.2           9.4                12.9 +/-    2.29      36.4 +/-    2.29  0.050 / 0.050
G20     197.4          25.4               12.9 +/-    2.67      25.0 +/-    2.67  0.040 / 0.060
G25     295.6          56.0               10.7 +/-    1.82      12.7 +/-    1.82  0.030 / 0.040
G29     306.4          27.5               11.6 +/-    1.96      21.5 +/-    1.96  0.030 / 0.040