PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-18:57:30
G03     232.8          68.6                9.8 +/-    0.64      10.4 +/-    0.64  0.050 / 0.050
G09     302.3          16.2                7.7 +/-    1.65      18.6 +/-    1.65  0.040 / 0.040
G14     98.3           16.5               10.3 +/-    1.44      24.7 +/-    1.44  0.040 / 0.040
G16     130.1          58.1               11.6 +/-    0.78      13.4 +/-    0.78  0.030 / 0.050
G22     193.8          55.8               10.7 +/-    0.79      12.6 +/-    0.79  0.160 / 0.270
G23     319.5          49.4                9.8 +/-    0.60      12.5 +/-    0.60  0.230 / 0.160
G26     70.4           51.9                8.8 +/-    0.46      10.9 +/-    0.46  0.140 / 0.260
G31     51.8           20.0                7.3 +/-    2.82      16.0 +/-    2.82  0.110 / 0.370