PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-13:13:10
G03     218.5          62.2                9.2 +/-    1.41      10.2 +/-    1.41  0.130 / 0.290
G07     253.0          11.5               -2.2 +/-   15.90      -6.0 +/-   15.90  0.120 / 0.300
G09     307.7          24.0                7.0 +/-    2.06      14.1 +/-    2.06  0.050 / 0.050
G14     104.4          13.4                5.8 +/-    1.48      15.0 +/-    1.48  0.050 / 0.070
G16     105.2          63.2                8.8 +/-    0.34       9.7 +/-    0.34  0.040 / 0.040
G22     186.7          44.3                8.2 +/-    0.68      11.1 +/-    0.68  0.030 / 0.030
G23     330.1          59.1                7.4 +/-    0.46       8.5 +/-    0.46  0.130 / 0.280
G26     57.2           45.3                6.6 +/-    0.66       8.9 +/-    0.66  0.120 / 0.260
G31     57.1           12.0                5.1 +/-    1.23      13.5 +/-    1.23  0.040 / 0.050