PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-15:43:10
G01     82.2           32.8               -9.6 +/-   15.66     -15.8 +/-   15.66  0.070 / 0.100
G07     130.9          36.1               25.2 +/-   13.22      39.2 +/-   13.22  0.060 / 0.100
G11     60.2           33.8                7.7 +/-    2.02      12.5 +/-    2.02  0.080 / 0.130
G13     289.0          36.4                9.1 +/-    0.78      14.1 +/-    0.78  0.080 / 0.150
G15     313.8          10.4               -7.6 +/-   19.86     -21.0 +/-   19.86  0.030 / 0.050
G17     220.0          62.6               13.5 +/-    0.49      15.0 +/-    0.49  0.040 / 0.050
G19     217.7          34.9              -50.7 +/-   49.53     -80.6 +/-   49.53  0.140 / 0.310
G28     1.5            60.9                5.7 +/-    2.28       6.4 +/-    2.28  0.030 / 0.030
G30     117.2          73.5               -3.6 +/-    8.77      -3.7 +/-    8.77  0.050 / 0.050