PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-17:57:50
G01     236.3          25.8               10.5 +/-    1.93      20.2 +/-    1.93  0.040 / 0.030
G03     306.1          61.4               10.0 +/-    1.06      11.2 +/-    1.06  0.030 / 0.030
G14     74.4           33.1                8.2 +/-    1.04      13.5 +/-    1.04  0.090 / 0.110
G16     156.0          32.4               13.0 +/-    2.35      21.7 +/-    2.35  0.080 / 0.110
G22     256.6          76.4               10.8 +/-    0.53      11.1 +/-    0.53  0.070 / 0.060
G23     298.7          30.1                9.9 +/-    0.96      17.4 +/-    0.96  0.050 / 0.060
G26     117.8          49.3               10.5 +/-    0.76      13.3 +/-    0.76  0.070 / 0.130
G31     41.6           42.8                7.6 +/-    1.18      10.6 +/-    1.18  0.080 / 0.130
G32     90.1           13.0                9.6 +/-    2.24      24.9 +/-    2.24  0.080 / 0.150