PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-13:27:40
G07     43.4           68.4                8.1 +/-    0.75       8.6 +/-    0.75  0.060 / 0.060
G08     54.7           42.4               -4.0 +/-   11.90      -5.6 +/-   11.90  0.070 / 0.060
G09     177.2          41.3                7.4 +/-    1.03      10.5 +/-    1.03  0.040 / 0.040
G11     121.3          30.6                7.2 +/-    5.02      12.4 +/-    5.02  0.030 / 0.040
G17     198.6          11.2               -2.8 +/-   17.67      -7.5 +/-   17.67  0.030 / 0.020
G23     160.9          14.8                7.7 +/-    1.58      19.3 +/-    1.58  0.020 / 0.020
G27     38.1           11.2                6.2 +/-    1.31      17.0 +/-    1.31  0.210 / 0.370
G28     267.5          49.4              -49.5 +/-   59.60     -63.0 +/-   59.60  0.150 / 0.250
G30     324.0          53.3                6.9 +/-    1.23       8.4 +/-    1.23  0.170 / 0.230