PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-22:13:10
G02     40.9949        49.4816         10.3177 +/-  0.5914   13.0960 +/-  0.5914  0.030 / 0.050
G05     116.2359       69.7762         10.6344 +/-  0.9949   11.2559 +/-  0.9949  0.030 / 0.050
G12     188.4025       52.0485         12.2179 +/-  1.1468   15.0375 +/-  1.1468  0.040 / 0.040
G20     199.6870       40.8831         12.7482 +/-  1.0368   18.2794 +/-  1.0368  0.040 / 0.040
G25     264.9595       60.3062         11.4976 +/-  0.9434   13.0226 +/-  0.9434  0.050 / 0.060
G29     316.6480       39.0350         11.1532 +/-  1.0409   16.4831 +/-  1.0409  0.050 / 0.070