PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-13:27:50
G02     200.2          16.6                6.3 +/-    2.57      15.0 +/-    2.57  0.240 / 0.300
G06     173.5          49.3                6.3 +/-    0.73       8.0 +/-    0.73  0.130 / 0.310
G13     231.6          15.5                5.9 +/-    1.86      14.4 +/-    1.86  0.120 / 0.160
G17     21.7           60.6                5.2 +/-    0.69       5.9 +/-    0.69  0.130 / 0.170
G19     318.4          71.9                5.1 +/-    0.56       5.4 +/-    0.56  0.090 / 0.150
G24     313.2          25.7                3.0 +/-    1.27       5.8 +/-    1.27  0.110 / 0.180
G28     84.7           41.2                5.4 +/-    1.16       7.7 +/-    1.16  0.040 / 0.030
G30     156.9          18.9                6.9 +/-    1.57      15.6 +/-    1.57  0.030 / 0.030