PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-22:27:50
G05     47.2           23.9                8.6 +/-    1.67      17.3 +/-    1.67  0.040 / 0.060
G13     81.8           37.5               11.6 +/-    0.88      17.6 +/-    0.88  0.060 / 0.070
G15     131.0          49.6               13.0 +/-    0.41      16.5 +/-    0.41  0.120 / 0.270
G18     242.4          39.0               12.9 +/-    2.02      19.1 +/-    2.02  0.110 / 0.240
G20     26.4           68.6               11.2 +/-    0.54      12.0 +/-    0.54  0.130 / 0.460
G21     310.0          45.4               11.0 +/-    1.43      14.7 +/-    1.43  0.210 / 0.440
G25     197.6          10.9               17.3 +/-    2.91      47.3 +/-    2.91  0.030 / 0.020
G26     293.2          19.7               10.5 +/-    2.04      23.2 +/-    2.04  0.030 / 0.030
G29     151.5          72.8               12.8 +/-    0.81      13.4 +/-    0.81  0.080 / 0.090