PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-04:12:30
G08     294.6          23.3                8.3 +/-    1.57      17.0 +/-    1.57  0.040 / 0.020
G10     358.4          62.8                6.3 +/-    0.78       7.0 +/-    0.78  0.040 / 0.030
G14     227.8          45.6               10.0 +/-    1.70      13.4 +/-    1.70  0.040 / 0.060
G18     57.2           54.2                7.1 +/-    0.64       8.5 +/-    0.64  0.040 / 0.060
G21     144.4          43.5                8.5 +/-    0.93      11.7 +/-    0.93  0.070 / 0.120
G24     60.1           27.8                5.9 +/-    1.72      10.8 +/-    1.72  0.060 / 0.090
G27     255.8          32.9                8.9 +/-    2.58      14.7 +/-    2.58  0.040 / 0.020
G32     240.6          64.7                8.6 +/-    0.59       9.4 +/-    0.59  0.050 / 0.020