PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-20:57:50
G02     30.2           58.0               10.2 +/-    0.49      11.8 +/-    0.49  0.040 / 0.040
G05     145.8          61.3               13.2 +/-    0.78      14.8 +/-    0.78  0.050 / 0.050
G06     54.6           15.0                7.8 +/-    2.34      19.5 +/-    2.34  0.040 / 0.060
G12     196.3          66.0               10.6 +/-    1.13      11.4 +/-    1.13  0.040 / 0.050
G20     197.8          28.3               17.1 +/-    1.31      31.0 +/-    1.31  0.100 / 0.110
G25     289.7          58.1               10.5 +/-    0.75      12.1 +/-    0.75  0.050 / 0.110
G29     308.7          30.0                9.8 +/-    1.30      17.1 +/-    1.30  0.020 / 0.050