PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:12:30
G02     11.8           69.1               13.3 +/-    0.40      14.1 +/-    0.40  0.050 / 0.040
G05     158.5          48.3               16.1 +/-    1.12      20.8 +/-    1.12  0.040 / 0.040
G06     48.0           25.3               11.4 +/-    2.53      22.1 +/-    2.53  0.030 / 0.030
G12     227.6          78.7               13.4 +/-    0.65      13.6 +/-    0.65  0.020 / 0.020
G19     90.9           15.6               12.8 +/-    1.78      31.3 +/-    1.78  0.050 / 0.060
G20     196.9          15.5               25.5 +/-    2.19      62.8 +/-    2.19  0.070 / 0.060
G25     308.3          48.2               14.2 +/-    1.47      18.3 +/-    1.47  0.040 / 0.050
G29     299.0          20.2               14.4 +/-    1.45      31.5 +/-    1.45  0.040 / 0.040