PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:12:30
G02     260.8192       77.5318         15.3255 +/-  0.6520   15.6569 +/-  0.6520  0.100 / 0.210
G05     170.9760       21.5019         21.4765 +/-  2.1536   45.5652 +/-  2.1536  0.100 / 0.190
G06     40.3728        49.6222         13.4226 +/-  0.4856   17.0071 +/-  0.4856  0.100 / 0.240
G12     320.4704       62.3395         13.6300 +/-  1.4134   15.1787 +/-  1.4134  0.070 / 0.200
G17     79.3344        15.0886         12.2848 +/-  1.4541   30.4911 +/-  1.4541  0.110 / 0.150
G19     67.0561        31.7092         13.9883 +/-  0.6541   23.6553 +/-  0.6541  0.080 / 0.150
G24     238.8647       30.3134         17.0523 +/-  1.8132   29.6686 +/-  1.8132  0.040 / 0.040
G25     317.7361       23.7370         12.9913 +/-  2.1649   26.1379 +/-  2.1649  0.030 / 0.030