PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-13:43:10
G01     85.4           32.5                8.2 +/-    0.47      13.7 +/-    0.47  0.030 / 0.030
G07     128.9          39.2                8.9 +/-    0.53      13.1 +/-    0.53  0.030 / 0.030
G11     63.0           35.6                6.3 +/-    0.81       9.9 +/-    0.81  0.030 / 0.070
G13     292.3          35.8                6.7 +/-    0.93      10.4 +/-    0.93  0.030 / 0.080
G17     217.4          60.1               11.1 +/-    0.69      12.6 +/-    0.69  0.060 / 0.130
G19     216.3          32.4                8.9 +/-    1.00      14.9 +/-    1.00  0.060 / 0.120
G28     356.9          61.2                7.3 +/-    0.69       8.2 +/-    0.69  0.080 / 0.130
G30     110.8          75.2                7.8 +/-    0.62       8.1 +/-    0.62  0.080 / 0.110