PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-09:12:30
G01     224.7971       15.8052          4.7783 +/-  3.7402   11.6545 +/-  3.7402  0.440 / 0.350
G03     286.9646       66.4967          3.2823 +/-  0.5774    3.5454 +/-  0.5774  0.400 / 0.260
G14     88.9922        21.5816          2.4143 +/-  1.1627    5.1124 +/-  1.1627  0.060 / 0.110
G16     146.3875       46.6780          5.6821 +/-  0.8543    7.4802 +/-  0.8543  0.070 / 0.100
G22     208.3397       69.1226          3.6750 +/-  0.4539    3.9046 +/-  0.4539  0.100 / 0.210
G23     307.8056       37.3594          2.4561 +/-  1.9206    3.7355 +/-  1.9206  0.100 / 0.200
G26     96.2220        54.7843          4.8134 +/-  0.4923    5.7481 +/-  0.4923  0.040 / 0.030
G31     45.6407        30.7424          1.8918 +/-  1.2685    3.2625 +/-  1.2685  0.040 / 0.030