PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-17:27:30
G01     40.1556        14.3898         11.0820 +/-  2.0799   27.9743 +/-  2.0799  0.160 / 0.220
G06     173.9592       41.9553         14.8124 +/-  1.0642   20.8840 +/-  1.0642  0.140 / 0.200
G13     237.6010       20.7326         12.3968 +/-  1.0515   26.7950 +/-  1.0515  0.160 / 0.350
G15     272.8098       11.5367         14.2631 +/-  1.9612   38.4816 +/-  1.9612  0.190 / 0.210
G17     11.5917        67.0134         12.0576 +/-  0.5474   12.9796 +/-  0.5474  0.120 / 0.220
G19     290.1875       71.5488         12.4175 +/-  0.6798   13.0172 +/-  0.6798  0.120 / 0.360
G24     316.6454       19.4908         12.6474 +/-  1.7833   28.1770 +/-  1.7833  0.230 / 0.280
G28     74.6462        45.7106         12.9457 +/-  0.6868   17.2707 +/-  0.6868  0.220 / 0.240
G30     155.5774       27.7270         13.2304 +/-  1.0697   24.3202 +/-  1.0697  0.070 / 0.120