PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-15:43:00
G01     85.0288        32.4317         12.0986 +/-  0.9816   20.1679 +/-  0.9816  0.040 / 0.060
G07     129.1492       38.2109         14.5348 +/-  0.6089   21.7826 +/-  0.6089  0.040 / 0.060
G11     62.4518        35.0718         12.7193 +/-  1.0299   20.1585 +/-  1.0299  0.050 / 0.110
G13     291.8692       35.9434         14.3779 +/-  1.4850   22.4261 +/-  1.4850  0.090 / 0.100
G17     217.6105       60.2236         12.5766 +/-  1.0570   14.2550 +/-  1.0570  0.070 / 0.090
G19     216.4158       32.6750         13.7649 +/-  2.3466   22.8360 +/-  2.3466  0.050 / 0.100
G28     356.8952       61.2187         12.8124 +/-  0.7992   14.3996 +/-  0.7992  0.020 / 0.020
G30     110.5233       75.4274         13.7094 +/-  1.0288   14.1167 +/-  1.0288  0.020 / 0.020