PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-08:43:10
G01     234.7723       24.9617          4.6413 +/-  1.6646    9.0768 +/-  1.6646  0.080 / 0.140
G03     307.9862       56.6902          2.5996 +/-  0.7020    3.0447 +/-  0.7020  0.090 / 0.130
G14     77.3880        29.5009          3.2318 +/-  0.8485    5.7190 +/-  0.8485  0.060 / 0.150
G16     155.5416       33.6580          5.3752 +/-  0.8557    8.7490 +/-  0.8557  0.070 / 0.130
G22     252.8001       76.5473          4.4202 +/-  0.7356    4.5318 +/-  0.7356  0.030 / 0.040
G23     298.1668       28.4910          0.3372 +/-  0.9448    0.6097 +/-  0.9448  0.030 / 0.040
G26     118.7125       49.6767          4.4944 +/-  0.9749    5.6907 +/-  0.9749  0.060 / 0.150
G31     41.4376        42.3257          2.2445 +/-  0.3793    3.1465 +/-  0.3793  0.060 / 0.130
G32     90.4383        13.4517          2.8103 +/-  1.5896    7.2545 +/-  1.5896  0.030 / 0.030