PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-09:12:30
G01     93.0           31.0                7.1 +/-    1.14      12.2 +/-    1.14  0.040 / 0.040
G07     123.3          46.1                7.8 +/-    1.50      10.4 +/-    1.50  0.040 / 0.050
G11     71.1           39.4                6.1 +/-    1.01       9.0 +/-    1.01  0.060 / 0.130
G13     299.1          33.9                8.1 +/-    1.15      13.2 +/-    1.15  0.060 / 0.140
G17     212.4          53.3                9.8 +/-    0.97      11.9 +/-    0.97  0.070 / 0.070
G19     213.4          26.3                8.6 +/-    1.95      16.3 +/-    1.95  0.040 / 0.060
G28     345.4          61.7                4.7 +/-    0.62       5.3 +/-    0.62  0.080 / 0.100
G30     91.3           77.9                4.4 +/-    0.92       4.5 +/-    0.92  0.070 / 0.110