PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:12:30
G02     27.8           60.1                9.5 +/-    0.71      10.8 +/-    0.71  0.040 / 0.050
G05     153.9          55.6               11.8 +/-    0.42      14.0 +/-    0.42  0.040 / 0.050
G06     51.2           20.5                8.3 +/-    3.71      18.1 +/-    3.71  0.030 / 0.030
G12     209.1          72.9                9.6 +/-    0.61      10.0 +/-    0.61  0.030 / 0.030
G19     97.2           11.1               10.7 +/-    1.67      29.3 +/-    1.67  0.040 / 0.040
G20     197.8          21.9               11.7 +/-    3.38      24.6 +/-    3.38  0.030 / 0.040
G25     300.8          52.9                9.2 +/-    1.33      11.2 +/-    1.33  0.040 / 0.030
G29     305.9          28.0                9.0 +/-    0.61      16.5 +/-    0.61  0.030 / 0.040