PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-19:12:30
G03     218.2          63.5                9.1 +/-    0.58      10.0 +/-    0.58  0.130 / 0.270
G07     251.3          10.1               -8.0 +/-   14.90     -22.3 +/-   14.90  0.110 / 0.180
G09     306.1          21.2                7.8 +/-    2.78      16.7 +/-    2.78  0.060 / 0.070
G14     103.7          12.2               10.0 +/-    2.68      26.5 +/-    2.68  0.060 / 0.060
G16     116.6          62.6               11.5 +/-    0.67      12.8 +/-    0.67  0.040 / 0.050
G22     190.0          48.7               11.3 +/-    1.82      14.5 +/-    1.82  0.040 / 0.050
G23     325.0          54.8                9.1 +/-    0.79      10.9 +/-    0.79  0.160 / 0.580
G26     61.0           48.2                7.8 +/-    0.70      10.1 +/-    0.70  0.100 / 0.460
G31     55.3           15.0                6.7 +/-    1.20      16.8 +/-    1.20  0.120 / 0.350