PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:42:50
G03     204.8097       46.1790          4.1601 +/-  2.0571    5.5141 +/-  2.0571  0.040 / 0.040
G07     269.4647       26.4818          5.9097 +/-  1.3251   11.1661 +/-  1.3251  0.030 / 0.040
G09     317.0488       41.4620          5.1064 +/-  0.9853    7.2552 +/-  0.9853  0.030 / 0.050
G16     64.2258        60.8250          4.4943 +/-  1.0486    5.0678 +/-  1.0486  0.030 / 0.040
G22     182.9458       27.5895          4.0825 +/-  1.1732    7.5270 +/-  1.1732  0.050 / 0.060
G23     343.2970       70.6738          4.1403 +/-  0.7999    4.3605 +/-  0.7999  0.060 / 0.060
G26     45.8694        33.4278          2.1703 +/-  0.6535    3.5482 +/-  0.6535  0.080 / 0.140
G27     122.2590       20.1391          4.9332 +/-  1.0280   10.8178 +/-  1.0280  0.060 / 0.120