PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:27:10
G02     219.9996       59.7199         16.2209 +/-  1.5851   18.4669 +/-  1.5851  0.070 / 0.050
G06     49.6189        69.9571         13.8163 +/-  0.6498   14.6087 +/-  0.6498  0.080 / 0.050
G12     320.5159       41.7563         12.8483 +/-  0.6881   18.1710 +/-  0.6881  0.050 / 0.070
G17     62.8601        27.3370         12.7226 +/-  1.0133   23.5873 +/-  1.0133  0.040 / 0.060
G19     46.8668        44.5696         13.3603 +/-  1.0651   18.1146 +/-  1.0651  0.050 / 0.100
G28     125.8571       10.0265         16.8175 +/-  2.0735   46.8827 +/-  2.0735  0.050 / 0.100