PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/27-13:42:50
G01     65.6           31.9                7.1 +/-    0.77      12.0 +/-    0.77  0.050 / 0.150
G06     181.7          10.3              -15.8 +/-   30.89     -43.9 +/-   30.89  0.050 / 0.150
G07     139.5          24.4                7.6 +/-    1.09      15.1 +/-    1.09  0.110 / 0.340
G11     50.2           25.3                6.8 +/-    0.90      13.1 +/-    0.90  0.110 / 0.410
G13     271.6          36.2                9.0 +/-    1.61      14.0 +/-    1.61  0.030 / 0.040
G15     300.8          15.3                3.8 +/-    2.25       9.5 +/-    2.25  0.030 / 0.050
G17     246.4          75.4                7.6 +/-    0.52       7.8 +/-    0.52  0.030 / 0.030
G19     228.0          48.0                8.7 +/-    1.39      11.3 +/-    1.39  0.020 / 0.030
G28     27.5           58.0                6.6 +/-    0.72       7.6 +/-    0.72  0.040 / 0.070
G30     139.0          59.5                7.6 +/-    0.93       8.7 +/-    0.93  0.040 / 0.090