PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-12:28:10
G07     321.1597       53.5408          3.6474 +/-  2.0879    4.4144 +/-  2.0879  0.030 / 0.060
G08     114.6114       46.4837          7.0620 +/-  0.7744    9.3214 +/-  0.7744  0.030 / 0.060
G09     231.2895       83.5553          2.7258 +/-  0.9268    2.7413 +/-  0.9268  0.070 / 0.260
G16     43.2349        17.9490          4.2186 +/-  1.1701    9.7613 +/-  1.1701  0.070 / 0.220
G23     150.1744       56.1431          6.0681 +/-  0.8873    7.1459 +/-  0.8873  0.040 / 0.050
G27     67.2592        35.5503          4.0550 +/-  0.6158    6.3703 +/-  0.6158  0.030 / 0.060
G28     228.9785       19.8060          6.4629 +/-  3.5697   14.2880 +/-  3.5697  0.100 / 0.160
G30     291.0290       25.1519          4.7381 +/-  1.3238    9.2257 +/-  1.3238  0.120 / 0.170