PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-09:57:50
G01     122.1          15.5                4.7 +/-    1.22      11.5 +/-    1.22  0.050 / 0.080
G07     74.2           66.5                4.2 +/-    0.56       4.6 +/-    0.56  0.040 / 0.040
G08     46.2           33.0                3.4 +/-    0.59       5.6 +/-    0.59  0.030 / 0.040
G09     176.1          28.4                6.4 +/-    3.13      11.5 +/-    3.13  0.020 / 0.040
G11     109.5          37.2                5.8 +/-    0.76       8.9 +/-    0.76  0.070 / 0.100
G13     320.2          14.5                2.2 +/-    3.30       5.6 +/-    3.30  0.090 / 0.130
G17     200.2          23.0                4.7 +/-    1.04       9.5 +/-    1.04  0.080 / 0.150
G28     286.8          56.0                5.8 +/-    1.05       6.9 +/-    1.05  0.050 / 0.140
G30     339.0          64.3                3.6 +/-    0.99       3.9 +/-    0.99  0.090 / 0.190