PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-19:27:30
G02     29.8           58.4               11.3 +/-    1.00      13.0 +/-    1.00  0.040 / 0.050
G05     150.9          58.9               11.4 +/-    0.41      13.1 +/-    0.41  0.040 / 0.050
G06     53.4           16.8                9.1 +/-    2.27      21.7 +/-    2.27  0.030 / 0.030
G12     200.0          68.5               11.7 +/-    0.31      12.5 +/-    0.31  0.020 / 0.030
G20     197.8          26.1               11.3 +/-    2.95      21.6 +/-    2.95  0.030 / 0.040
G25     293.9          56.5                9.7 +/-    1.16      11.4 +/-    1.16  0.030 / 0.040
G29     307.8          29.4               12.0 +/-    2.45      21.2 +/-    2.45  0.060 / 0.100