PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-12:12:30
G02     203.8          37.2                8.0 +/-    2.51      12.2 +/-    2.51  0.070 / 0.200
G06     162.3          70.1                7.7 +/-    1.27       8.2 +/-    1.27  0.070 / 0.170
G12     308.8          16.3                3.1 +/-    2.34       7.5 +/-    2.34  0.110 / 0.210
G17     40.3           45.6                4.2 +/-    1.15       5.6 +/-    1.15  0.120 / 0.180
G19     10.5           62.8                6.0 +/-    1.63       6.6 +/-    1.63  0.040 / 0.070
G24     297.0          38.2                7.8 +/-    0.86      11.7 +/-    0.86  0.030 / 0.050
G28     105.4          29.0                6.1 +/-    1.32      10.9 +/-    1.32  0.030 / 0.030