PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:27:30
G03     210.3717       52.8554          4.4418 +/-  0.7887    5.4170 +/-  0.7887  0.040 / 0.050
G07     263.5894       22.4082          4.4976 +/-  0.9674    9.3373 +/-  0.9674  0.040 / 0.060
G09     314.2314       35.5250          2.5158 +/-  1.6258    3.9541 +/-  1.6258  0.030 / 0.050
G16     79.0995        64.2906          6.2370 +/-  0.5759    6.8422 +/-  0.5759  0.030 / 0.050
G22     184.8042       34.3325          4.5147 +/-  2.0051    7.2547 +/-  2.0051  0.050 / 0.070
G23     335.0988       64.5374          4.1868 +/-  0.4820    4.5848 +/-  0.4820  0.040 / 0.050
G26     49.2451        39.1747          2.7316 +/-  0.4977    4.0276 +/-  0.4977  0.070 / 0.210
G27     127.7310       15.6052          5.0610 +/-  1.3266   12.4044 +/-  1.3266  0.070 / 0.180