PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:57:30
G01     48.2288        23.7284         12.0459 +/-  1.6140   24.2407 +/-  1.6140  0.120 / 0.190
G06     176.9902       27.7750         14.4782 +/-  2.7403   26.5860 +/-  2.7403  0.080 / 0.180
G11     43.4804        10.3023         12.7337 +/-  2.0490   35.2927 +/-  2.0490  0.060 / 0.170
G13     250.1685       29.0905         13.2022 +/-  2.1066   23.5662 +/-  2.1066  0.070 / 0.130
G15     285.4298       14.7646         11.4269 +/-  1.5117   28.5853 +/-  1.5117  0.110 / 0.100
G17     338.4566       77.3301         12.7689 +/-  0.3041   13.0542 +/-  0.3041  0.100 / 0.100
G19     252.7747       63.9944         13.9586 +/-  0.8134   15.3469 +/-  0.8134  0.060 / 0.050
G28     55.9427        51.9128         12.9591 +/-  0.7962   15.9747 +/-  0.7962  0.060 / 0.060
G30     150.8837       41.5428         13.5975 +/-  0.5659   19.2948 +/-  0.5659  0.020 / 0.050