PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-21:42:20
G02     31.4           57.1               10.2 +/-    0.56      11.9 +/-    0.56  0.040 / 0.050
G05     141.5          63.1               13.5 +/-    0.77      15.0 +/-    0.77  0.050 / 0.060
G06     55.6           13.5                7.3 +/-    1.19      18.7 +/-    1.19  0.060 / 0.080
G12     193.9          63.7               10.8 +/-    1.03      11.9 +/-    1.03  0.070 / 0.120
G20     197.9          30.3               13.2 +/-    2.84      23.1 +/-    2.84  0.030 / 0.050
G25     287.0          58.5               10.8 +/-    1.70      12.4 +/-    1.70  0.030 / 0.040
G29     309.8          31.1               10.0 +/-    1.49      17.1 +/-    1.49  0.030 / 0.040