PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-03:57:50
G08     301.5          22.2                6.6 +/-    1.67      13.7 +/-    1.67  0.050 / 0.030
G10     344.0          61.5                6.5 +/-    1.07       7.2 +/-    1.07  0.040 / 0.030
G14     222.6          39.3               10.8 +/-    2.53      15.8 +/-    2.53  0.070 / 0.150
G18     47.1           57.5                5.9 +/-    1.29       6.8 +/-    1.29  0.080 / 0.140
G21     140.0          50.3                8.8 +/-    0.71      11.1 +/-    0.71  0.040 / 0.080
G24     67.3           29.7                8.0 +/-    0.95      14.1 +/-    0.95  0.050 / 0.080
G27     263.8          35.7               10.3 +/-    3.53      16.2 +/-    3.53  0.030 / 0.050
G32     230.9          58.5               10.2 +/-    1.81      11.7 +/-    1.81  0.040 / 0.050