PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-17:42:30
G07     317.4          51.4               14.1 +/-    1.10      17.5 +/-    1.10  0.220 / 0.320
G08     122.0          46.8               16.6 +/-    0.44      21.8 +/-    0.44  0.270 / 0.330
G09     242.9          82.7               16.7 +/-    0.47      16.8 +/-    0.47  0.050 / 0.060
G16     43.8           14.9                9.7 +/-    2.59      24.2 +/-    2.59  0.040 / 0.050
G23     149.3          48.7               16.6 +/-    0.46      21.3 +/-    0.46  0.040 / 0.060
G27     66.5           35.8               13.1 +/-    1.17      20.4 +/-    1.17  0.050 / 0.040
G28     229.6          21.0               16.8 +/-    2.15      36.0 +/-    2.15  0.060 / 0.100
G30     294.1          29.3               12.7 +/-    3.08      22.6 +/-    3.08  0.090 / 0.090