PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-20:27:30
G01     228.0          18.5               11.7 +/-    1.77      26.7 +/-    1.77  0.030 / 0.040
G03     289.4          67.7                8.5 +/-    1.23       9.1 +/-    1.23  0.030 / 0.040
G14     84.6           26.0               10.8 +/-    1.21      20.7 +/-    1.21  0.040 / 0.080
G16     150.9          42.2                6.1 +/-    1.13       8.6 +/-    1.13  0.040 / 0.080
G22     220.9          72.2               10.2 +/-    1.10      10.7 +/-    1.10  0.050 / 0.070
G23     306.0          36.1                9.2 +/-    1.05      14.3 +/-    1.05  0.040 / 0.080
G26     102.1          53.9               11.3 +/-    0.47      13.6 +/-    0.47  0.110 / 0.350
G31     44.3           34.4                8.2 +/-    0.98      13.1 +/-    0.98  0.110 / 0.360