PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-13:57:40
G08     55.9609        43.2343        -14.3073 +/-  8.1193  -19.7827 +/-  8.1193  0.110 / 0.160
G09     177.5919       42.9033         -4.6961 +/-  5.8441   -6.5257 +/-  5.8441  0.150 / 0.180
G11     122.3474       29.8649         22.5945 +/-  6.8622   39.6794 +/-  6.8622  0.040 / 0.050
G17     198.5997       10.0287         -8.8191 +/- 10.8460  -24.5842 +/- 10.8460  0.040 / 0.070
G23     160.7931       15.8738          9.1842 +/-  0.9606   22.3631 +/-  0.9606  0.100 / 0.240
G27     38.4897        12.2041          6.4598 +/-  0.7566   17.1670 +/-  0.7566  0.060 / 0.070
G28     265.7505       48.5860        -85.2690 +/- 32.1023  -109.4622 +/- 32.1023  0.060 / 0.080
G30     322.8044       52.1954          9.3386 +/-  1.2022   11.4744 +/-  1.2022  0.060 / 0.140