PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:42:30
G03     204.8097       46.1790          5.6135 +/-  0.6838    7.4405 +/-  0.6838  0.060 / 0.050
G07     269.4647       26.4818          4.0608 +/-  1.3327    7.6727 +/-  1.3327  0.060 / 0.050
G09     317.0488       41.4620          4.2240 +/-  1.6693    6.0014 +/-  1.6693  0.090 / 0.140
G16     64.2258        60.8250          4.6382 +/-  0.9277    5.2301 +/-  0.9277  0.120 / 0.160
G22     182.9458       27.5895          2.2105 +/-  1.1718    4.0756 +/-  1.1718  0.020 / 0.030
G23     343.2970       70.6738          2.6840 +/-  0.7623    2.8267 +/-  0.7623  0.030 / 0.030
G26     45.8694        33.4278          2.9117 +/-  1.2074    4.7603 +/-  1.2074  0.090 / 0.140
G27     122.2590       20.1391          4.0896 +/-  1.4086    8.9679 +/-  1.4086  0.080 / 0.120