PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-22:28:10
G02     46.9023        44.6444         10.9979 +/-  0.6953   14.8955 +/-  0.6953  0.050 / 0.070
G05     93.5101        70.5806          9.9480 +/-  0.6094   10.4822 +/-  0.6094  0.040 / 0.050
G12     186.5124       44.5346         11.6057 +/-  1.7697   15.7435 +/-  1.7697  0.030 / 0.040
G20     201.4521       48.0801         12.5793 +/-  1.6239   16.2542 +/-  1.6239  0.030 / 0.030
G25     250.2565       58.6205         12.1638 +/-  0.4145   13.9863 +/-  0.4145  0.040 / 0.070
G29     321.0739       44.6794          9.9454 +/-  1.4556   13.4632 +/-  1.4556  0.040 / 0.060