PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-18:42:40
G07     1.8            66.1               15.4 +/-    0.76      16.7 +/-    0.76  0.040 / 0.040
G08     75.4           53.1               16.2 +/-    0.81      19.7 +/-    0.81  0.030 / 0.040
G09     181.7          56.0               17.5 +/-    0.32      20.7 +/-    0.32  0.100 / 0.200
G11     135.9          23.5               17.5 +/-    2.83      35.5 +/-    2.83  0.100 / 0.210
G23     157.9          20.5               16.2 +/-    1.87      35.2 +/-    1.87  0.060 / 0.050
G27     42.7           20.7               13.1 +/-    2.17      28.3 +/-    2.17  0.050 / 0.040
G28     253.2          42.3               17.3 +/-    2.32      24.2 +/-    2.32  0.030 / 0.030
G30     317.1          48.1               15.3 +/-    0.50      19.8 +/-    0.50  0.040 / 0.040