PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-19:57:40
G02     235.8842       70.7972         12.7839 +/-  0.4589   13.4545 +/-  0.4589  0.200 / 0.430
G05     174.0875       13.8735         14.9534 +/-  0.7896   38.2163 +/-  0.7896  0.230 / 0.380
G06     41.1740        58.2040         10.9207 +/-  0.6158   12.6055 +/-  0.6158  0.080 / 0.280
G12     322.1231       53.4284         11.9511 +/-  1.1482   14.4822 +/-  1.1482  0.070 / 0.280
G17     72.3789        20.1942         10.7099 +/-  1.0833   23.4539 +/-  1.0833  0.070 / 0.150
G19     58.8113        37.0394         10.2209 +/-  1.0206   15.6326 +/-  1.0206  0.060 / 0.140
G24     247.6690       35.4487         12.8028 +/-  1.4021   20.1503 +/-  1.4021  0.030 / 0.050
G25     316.9107       16.0490         10.7295 +/-  3.0489   26.0140 +/-  3.0489  0.040 / 0.050