PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-18:27:30
G02     205.6          34.1               14.7 +/-    1.71      23.7 +/-    1.71  0.070 / 0.090
G06     150.9          73.1               12.5 +/-    1.02      13.0 +/-    1.02  0.050 / 0.090
G12     310.4          19.6               11.5 +/-    1.25      25.6 +/-    1.25  0.030 / 0.060
G17     41.9           44.3                8.7 +/-    0.88      11.9 +/-    0.88  0.030 / 0.060
G19     13.8           61.7               12.1 +/-    0.82      13.5 +/-    0.82  0.110 / 0.220
G24     295.7          38.8               12.0 +/-    1.73      17.9 +/-    1.73  0.130 / 0.230
G28     106.4          28.5                8.9 +/-    0.71      16.1 +/-    0.71  0.080 / 0.100