PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-21:57:20
G02     41.4           49.1               11.1 +/-    0.71      14.1 +/-    0.71  0.040 / 0.040
G05     116.4          69.9                9.9 +/-    0.86      10.5 +/-    0.86  0.040 / 0.050
G12     188.5          52.0               12.7 +/-    1.38      15.6 +/-    1.38  0.040 / 0.040
G20     199.8          41.0               13.7 +/-    1.50      19.7 +/-    1.50  0.030 / 0.040
G25     264.2          60.4               12.4 +/-    1.22      14.1 +/-    1.22  0.060 / 0.070
G29     316.8          39.3               11.2 +/-    1.30      16.5 +/-    1.30  0.040 / 0.080