PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-13:58:10
G07     47.0576        68.2168          9.6326 +/-  0.6948   10.2903 +/-  0.6948  0.130 / 0.340
G08     53.7775        41.6275          8.9105 +/-  0.9908   12.6272 +/-  0.9908  0.100 / 0.300
G09     177.3446       40.3741          9.9802 +/-  0.8391   14.4279 +/-  0.8391  0.240 / 0.330
G11     120.1468       31.2141          9.8352 +/-  0.8315   16.7990 +/-  0.8315  0.140 / 0.290
G17     198.7251       12.1944          6.8336 +/-  5.4623   18.1645 +/-  5.4623  0.070 / 0.150
G23     160.8998       13.6826          9.4445 +/-  1.9690   24.2472 +/-  1.9690  0.050 / 0.160
G27     37.8739        10.3600          9.0640 +/-  1.1999   25.0909 +/-  1.1999  0.030 / 0.040
G28     268.9354       49.9481          9.1169 +/-  0.9440   11.5051 +/-  0.9440  0.020 / 0.040
G30     324.9831       54.0384          9.1607 +/-  0.4984   11.0272 +/-  0.4984  0.050 / 0.050