PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-02:57:30
G02     33.8           55.0                5.7 +/-    1.00       6.7 +/-    1.00  0.190 / 0.200
G05     137.3          61.9                7.6 +/-    0.81       8.5 +/-    0.81  0.350 / 0.230
G06     53.3           16.6                3.4 +/-    3.25       8.2 +/-    3.25  0.030 / 0.030
G12     201.4          69.1                6.8 +/-    0.38       7.2 +/-    0.38  0.030 / 0.040
G19     99.1           11.1                4.8 +/-    1.90      13.1 +/-    1.90  0.030 / 0.030
G25     299.3          52.0                7.2 +/-    1.60       8.8 +/-    1.60  0.030 / 0.040
G29     306.5          26.9                7.7 +/-    1.78      14.4 +/-    1.78  0.050 / 0.050