PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:12:30
G02     214.5310       52.8956         17.7095 +/-  1.3794   21.5876 +/-  1.3794  0.040 / 0.080
G06     64.8857        75.9301         15.0706 +/-  0.5464   15.4875 +/-  0.5464  0.060 / 0.090
G12     318.4738       35.4109         14.5265 +/-  1.9351   22.8791 +/-  1.9351  0.050 / 0.080
G17     57.3191        31.6432         13.5324 +/-  1.0861   22.9147 +/-  1.0861  0.050 / 0.070
G19     39.3481        49.0905         13.8269 +/-  1.1824   17.6364 +/-  1.1824  0.040 / 0.050
G24     271.2905       41.8727         15.2332 +/-  1.8413   21.5049 +/-  1.8413  0.040 / 0.070
G28     121.3667       15.2111         15.9724 +/-  1.7969   39.5257 +/-  1.7969  0.040 / 0.110