PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-10:27:50
G02     63.7           28.3                3.4 +/-    0.78       6.2 +/-    0.78  0.030 / 0.030
G05     53.5           57.3                5.0 +/-    0.43       5.8 +/-    0.43  0.020 / 0.040
G12     185.6          30.1                5.8 +/-    1.64      10.1 +/-    1.64  0.050 / 0.060
G13     126.4          17.5                6.8 +/-    0.96      15.8 +/-    0.96  0.040 / 0.060
G15     160.5          15.6                6.5 +/-    2.26      15.8 +/-    2.26  0.080 / 0.240
G20     212.3          59.6                8.2 +/-    0.49       9.3 +/-    0.49  0.090 / 0.240
G21     275.4          22.4                3.5 +/-    0.98       7.2 +/-    0.98  0.050 / 0.100
G25     232.6          49.3                6.5 +/-    1.53       8.3 +/-    1.53  0.040 / 0.110
G29     333.1          60.5                5.3 +/-    0.72       6.0 +/-    0.72  0.050 / 0.070