PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-17:12:40
G02     25.8           61.6               10.9 +/-    0.64      12.2 +/-    0.64  0.030 / 0.030
G05     155.7          53.7               13.0 +/-    1.11      15.7 +/-    1.11  0.020 / 0.030
G06     50.3           21.9                8.7 +/-    1.17      18.2 +/-    1.17  0.040 / 0.050
G12     213.7          74.6               10.3 +/-    0.85      10.7 +/-    0.85  0.040 / 0.050
G19     95.7           12.2               11.8 +/-    0.84      31.5 +/-    0.84  0.090 / 0.310
G20     197.7          20.2               12.2 +/-    1.99      26.8 +/-    1.99  0.080 / 0.300
G25     303.0          51.6               11.1 +/-    1.85      13.7 +/-    1.85  0.040 / 0.050
G29     304.6          26.6                8.2 +/-    2.26      15.4 +/-    2.26  0.040 / 0.040