PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-04:28:00
G08     289.4245       23.5503          5.5461 +/-  0.8224   11.2074 +/-  0.8224  0.030 / 0.020
G10     9.4247         63.2380          5.1722 +/-  0.8225    5.7194 +/-  0.8225  0.040 / 0.020
G14     232.3937       50.0913          6.3659 +/-  1.8580    8.0194 +/-  1.8580  0.220 / 0.140
G18     63.8857        51.6999          3.3303 +/-  1.5641    4.1154 +/-  1.5641  0.180 / 0.180
G21     147.0370       38.5460          6.0249 +/-  0.8148    8.9778 +/-  0.8148  0.020 / 0.020
G24     55.4174        25.7526          4.3109 +/-  2.7286    8.2799 +/-  2.7286  0.030 / 0.020
G27     250.4551       30.2772          6.5973 +/-  2.1623   11.4869 +/-  2.1623  0.050 / 0.090
G32     250.2754       68.7924          5.6647 +/-  0.3677    6.0303 +/-  0.3677  0.070 / 0.100