PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-13:27:40
G01     94.1           30.6                7.6 +/-    0.61      13.2 +/-    0.61  0.050 / 0.040
G07     122.4          45.6                9.1 +/-    1.37      12.2 +/-    1.37  0.030 / 0.030
G11     71.2           38.7                7.2 +/-    0.95      10.7 +/-    0.95  0.030 / 0.060
G13     300.6          33.2                6.9 +/-    0.89      11.3 +/-    0.89  0.030 / 0.060
G17     211.5          52.6               10.5 +/-    1.69      12.8 +/-    1.69  0.060 / 0.140
G19     212.8          25.5               10.8 +/-    2.12      20.8 +/-    2.12  0.060 / 0.130
G28     342.2          61.7                6.1 +/-    0.62       6.8 +/-    0.62  0.060 / 0.130
G30     78.7           79.5                7.2 +/-    0.72       7.3 +/-    0.72  0.060 / 0.120