PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:12:20
G02     214.5310       52.8956         17.2817 +/-  1.0306   21.0661 +/-  1.0306  0.050 / 0.050
G06     64.8857        75.9301         13.9673 +/-  0.4076   14.3536 +/-  0.4076  0.060 / 0.060
G12     318.4738       35.4109         13.1734 +/-  1.5183   20.7480 +/-  1.5183  0.090 / 0.070
G17     57.3191        31.6432         11.8814 +/-  1.5516   20.1190 +/-  1.5516  0.060 / 0.070
G19     39.3481        49.0905         12.4183 +/-  0.8848   15.8397 +/-  0.8848  0.060 / 0.080
G28     121.3667       15.2111         16.3140 +/-  1.7491   40.3712 +/-  1.7491  0.070 / 0.080