PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-12:43:10
G07     330.9177       57.1787          4.3447 +/-  0.4058    5.0643 +/-  0.4058  0.020 / 0.020
G08     104.3667       49.6845        -16.3716 +/-  6.4578  -20.7275 +/-  6.4578  0.020 / 0.020
G09     195.0749       78.0353          5.5562 +/-  0.2893    5.6667 +/-  0.2893  0.020 / 0.030
G11     146.4527       9.9641          -6.3294 +/-  3.8773  -17.6677 +/-  3.8773  0.030 / 0.040
G16     45.1066        12.2837          5.0096 +/-  1.6124   13.2888 +/-  1.6124  0.040 / 0.050
G23     153.6590       48.7172          6.0705 +/-  0.5998    7.7798 +/-  0.5998  0.040 / 0.050
G27     59.4622        33.2344          5.4827 +/-  0.5764    8.9971 +/-  0.5764  0.060 / 0.070
G28     233.5929       25.4569        -56.3245 +/- 21.4833  -108.9113 +/- 21.4833  0.060 / 0.070
G30     296.3959       29.5037          3.1700 +/-  2.6842    5.6094 +/-  2.6842  0.090 / 0.130