PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-13:43:00
G01     74.5           33.0                6.4 +/-    0.52      10.6 +/-    0.52  0.110 / 0.160
G07     135.3          31.2                8.7 +/-    1.16      14.8 +/-    1.16  0.090 / 0.220
G11     55.1           30.5                6.2 +/-    1.51      10.8 +/-    1.51  0.080 / 0.110
G13     281.2          36.9                5.7 +/-    1.49       8.7 +/-    1.49  0.070 / 0.080
G15     307.5          13.5                3.0 +/-    2.14       7.8 +/-    2.14  0.030 / 0.020
G17     228.8          68.9                7.3 +/-    0.67       7.7 +/-    0.67  0.030 / 0.030
G19     221.9          40.9                8.8 +/-    1.71      12.7 +/-    1.71  0.050 / 0.080
G28     14.0           59.8                5.8 +/-    0.63       6.6 +/-    0.63  0.250 / 0.190
G30     130.1          67.1                7.4 +/-    0.81       7.9 +/-    0.81  0.030 / 0.030