PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-21:28:10
G02     24.5           62.0               11.0 +/-    0.99      12.3 +/-    0.99  0.050 / 0.050
G05     150.5          57.4               12.2 +/-    0.49      14.1 +/-    0.49  0.040 / 0.050
G06     52.3           18.1                8.5 +/-    2.76      19.5 +/-    2.76  0.050 / 0.050
G12     201.0          70.5               11.4 +/-    0.51      12.0 +/-    0.51  0.050 / 0.060
G19     98.2           10.3               11.3 +/-    1.60      31.3 +/-    1.60  0.030 / 0.030
G20     197.2          24.0               13.5 +/-    3.80      27.0 +/-    3.80  0.030 / 0.030
G25     297.8          55.1                9.1 +/-    2.71      10.8 +/-    2.71  0.110 / 0.150
G29     305.4          26.5                9.5 +/-    1.00      18.0 +/-    1.00  0.090 / 0.120