PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-14:27:30
G03     222.8          64.9               10.2 +/-    1.51      11.2 +/-    1.51  0.130 / 0.320
G09     305.7          20.9                5.9 +/-    2.52      12.8 +/-    2.52  0.140 / 0.400
G14     101.9          15.1                8.1 +/-    1.85      20.2 +/-    1.85  0.040 / 0.050
G16     114.6          61.9                9.5 +/-    0.54      10.6 +/-    0.54  0.040 / 0.050
G22     186.5          47.1                9.5 +/-    0.56      12.5 +/-    0.56  0.050 / 0.040
G23     327.7          56.9                7.9 +/-    0.71       9.2 +/-    0.71  0.050 / 0.040
G26     61.3           47.8                7.5 +/-    0.59       9.8 +/-    0.59  0.060 / 0.070
G31     55.1           14.6                6.7 +/-    4.71      16.7 +/-    4.71  0.040 / 0.060