PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-13:13:00
G07     44.9           68.4                7.3 +/-    0.68       7.8 +/-    0.68  0.070 / 0.070
G08     54.2           41.9                1.2 +/-   11.29       1.7 +/-   11.29  0.070 / 0.060
G09     177.0          40.4                8.2 +/-    1.37      11.8 +/-    1.37  0.030 / 0.020
G11     120.8          31.0                7.1 +/-    4.09      12.2 +/-    4.09  0.020 / 0.020
G17     198.7          11.8                1.5 +/-   16.28       4.0 +/-   16.28  0.040 / 0.030
G23     161.0          14.3                6.7 +/-    1.57      16.9 +/-    1.57  0.040 / 0.030
G27     38.0           10.7                6.4 +/-    2.31      17.5 +/-    2.31  0.120 / 0.270
G28     268.3          49.8              -17.5 +/-   54.41     -22.1 +/-   54.41  0.120 / 0.200
G30     324.7          53.8                6.3 +/-    0.70       7.6 +/-    0.70  0.130 / 0.290