PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-14:12:40
G01     121.3          15.9                9.0 +/-    1.42      21.8 +/-    1.42  0.080 / 0.120
G07     78.7           64.9                8.8 +/-    0.69       9.6 +/-    0.69  0.110 / 0.140
G08     45.8           32.3                6.6 +/-    1.04      11.1 +/-    1.04  0.040 / 0.030
G09     176.1          27.9                8.7 +/-    1.70      16.0 +/-    1.70  0.030 / 0.030
G11     107.2          37.1                9.1 +/-    1.29      13.9 +/-    1.29  0.110 / 0.430
G13     319.8          15.3                5.9 +/-    2.73      14.6 +/-    2.73  0.130 / 0.350
G17     200.3          23.8                8.8 +/-    2.77      17.7 +/-    2.77  0.040 / 0.030
G28     287.5          55.9                8.7 +/-    1.84      10.2 +/-    1.84  0.040 / 0.030
G30     338.0          63.9                9.6 +/-    0.73      10.6 +/-    0.73  0.150 / 0.290