PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-02:57:40
G10     294.2963       50.2430          9.5931 +/-  0.6284   12.0623 +/-  0.6284  0.040 / 0.050
G14     209.6572       12.2452         13.0913 +/-  5.4808   34.7579 +/-  5.4808  0.040 / 0.050
G15     46.8667        32.4999          6.1651 +/-  0.7706   10.2632 +/-  0.7706  0.060 / 0.090
G18     350.0171       66.4134          8.3043 +/-  0.5268    8.9749 +/-  0.5268  0.080 / 0.100
G20     70.9818        17.4932          5.8702 +/-  0.8432   13.7363 +/-  0.8432  0.060 / 0.100
G21     90.4599        75.1352         10.0342 +/-  0.8926   10.3448 +/-  0.8926  0.060 / 0.140
G24     100.5186       25.8789         10.0275 +/-  0.6197   19.2050 +/-  0.6197  0.050 / 0.040
G27     300.2615       34.5545         11.1440 +/-  0.7084   17.8330 +/-  0.7084  0.050 / 0.040
G32     210.3692       30.1939         12.7486 +/-  1.3338   22.2357 +/-  1.3338  0.070 / 0.210