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               11.7 +/-    0.63      13.5 +/-    0.63  0.050 / 0.060
G05     150.9          58.9               12.2 +/-    0.72      14.0 +/-    0.72  0.040 / 0.060
G06     53.4           16.8                7.9 +/-    0.55      18.9 +/-    0.55  0.020 / 0.040
G12     200.0          68.5               10.4 +/-    0.93      11.1 +/-    0.93  0.030 / 0.040
G20     197.8          26.1               12.2 +/-    2.40      23.2 +/-    2.40  0.070 / 0.120
G25     293.9          56.5               11.8 +/-    1.33      13.9 +/-    1.33  0.060 / 0.130
G29     307.8          29.4               11.1 +/-    1.34      19.6 +/-    1.34  0.030 / 0.050