PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-18:58:00
G07     0.4            65.8               13.1 +/-    0.51      14.2 +/-    0.51  0.040 / 0.030
G08     76.8           53.5               13.3 +/-    0.84      16.1 +/-    0.84  0.040 / 0.020
G09     181.9          56.8               15.2 +/-    0.44      17.8 +/-    0.44  0.090 / 0.190
G11     136.5          23.0               13.5 +/-    1.74      27.5 +/-    1.74  0.130 / 0.210
G23     157.9          21.3               13.9 +/-    1.87      29.7 +/-    1.87  0.040 / 0.020
G27     43.0           21.1               10.3 +/-    2.17      22.1 +/-    2.17  0.040 / 0.010
G28     252.5          41.9               14.9 +/-    2.32      21.1 +/-    2.32  0.060 / 0.030
G30     316.6          47.8               12.9 +/-    0.67      16.8 +/-    0.67  0.060 / 0.030