PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-15:58:00
G01     76.6018        32.9788         12.7245 +/-  1.5270   20.9850 +/-  1.5270  0.120 / 0.250
G07     134.0924       31.9971         14.0527 +/-  0.9913   23.6279 +/-  0.9913  0.180 / 0.170
G11     56.2369        31.1041         11.8063 +/-  1.6285   20.2108 +/-  1.6285  0.060 / 0.090
G13     283.2652       36.9693         12.8827 +/-  2.6282   19.7283 +/-  2.6282  0.070 / 0.080
G15     310.3119       12.0836         12.4895 +/-  2.4959   33.2826 +/-  2.4959  0.070 / 0.090
G17     225.8901       67.0472         13.8414 +/-  0.9087   14.8966 +/-  0.9087  0.070 / 0.100
G19     220.5817       39.2676         14.0945 +/-  1.0412   20.7493 +/-  1.0412  0.060 / 0.090
G28     10.1482        60.2165         12.5131 +/-  0.8868   14.1838 +/-  0.8868  0.060 / 0.080
G30     126.7696       69.4048         13.2978 +/-  0.8780   14.1050 +/-  0.8780  0.030 / 0.020