PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-22:58:10
G02     61.3           32.9               10.1 +/-    0.52      16.7 +/-    0.52  0.040 / 0.070
G05     54.7           60.2               10.4 +/-    0.63      11.8 +/-    0.63  0.040 / 0.080
G12     183.2          26.5               14.3 +/-    2.00      27.0 +/-    2.00  0.120 / 0.270
G13     126.0          18.3               12.2 +/-    1.13      28.1 +/-    1.13  0.100 / 0.300
G15     163.5          14.1               13.7 +/-    1.90      34.8 +/-    1.90  0.030 / 0.070
G20     209.2          66.9               12.3 +/-    0.79      13.2 +/-    0.79  0.030 / 0.060
G21     274.4          19.9               10.0 +/-    2.12      22.1 +/-    2.12  0.060 / 0.130
G25     223.9          47.0               12.9 +/-    1.86      16.9 +/-    1.86  0.080 / 0.130
G29     332.4          60.5               11.8 +/-    1.06      13.3 +/-    1.06  0.030 / 0.040