PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-12:43:10
G08     107.3126       48.9422          6.2413 +/-  0.5713    7.9758 +/-  0.5713  0.030 / 0.060
G09     200.9918       79.8864          5.7945 +/-  1.0464    5.8765 +/-  1.0464  0.030 / 0.050
G16     44.5448        13.7729          4.3028 +/-  1.2493   11.0230 +/-  1.2493  0.070 / 0.120
G23     152.8026       50.7223          7.4308 +/-  1.2194    9.2895 +/-  1.2194  0.080 / 0.110
G27     61.4881        33.9783          4.6658 +/-  0.7141    7.5481 +/-  0.7141  0.120 / 0.330
G28     232.2659       23.9244          6.4083 +/-  1.4494   12.8368 +/-  1.4494  0.090 / 0.170
G30     294.9213       28.2926          2.5400 +/-  2.1467    4.6120 +/-  2.1467  0.020 / 0.030