PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-22:57:30
G02     60.9           33.2               10.2 +/-    1.11      16.8 +/-    1.11  0.050 / 0.080
G05     55.3           60.6                9.9 +/-    0.42      11.2 +/-    0.42  0.050 / 0.090
G12     183.3          26.9               12.1 +/-    1.05      22.6 +/-    1.05  0.090 / 0.060
G13     126.4          18.0               11.7 +/-    2.60      27.1 +/-    2.60  0.090 / 0.100
G15     163.7          13.7               13.5 +/-    1.42      34.6 +/-    1.42  0.110 / 0.300
G20     208.9          66.4               11.2 +/-    0.55      12.1 +/-    0.55  0.110 / 0.240
G21     274.1          19.6               11.7 +/-    1.56      26.1 +/-    1.56  0.100 / 0.130
G25     224.4          47.3               11.7 +/-    2.24      15.3 +/-    2.24  0.100 / 0.140
G29     332.1          60.1                9.6 +/-    0.30      10.9 +/-    0.30  0.020 / 0.030