PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/21-12:12:30
G02     204.2          34.4                5.6 +/-    0.99       9.0 +/-    0.99  0.060 / 0.090
G06     153.3          71.0                4.6 +/-    0.35       4.8 +/-    0.35  0.070 / 0.090
G12     307.9          17.2                2.8 +/-    2.82       6.6 +/-    2.82  0.030 / 0.040
G17     35.3           49.7                2.8 +/-    0.69       3.5 +/-    0.69  0.030 / 0.050
G19     8.2            63.5                2.6 +/-    0.52       2.8 +/-    0.52  0.130 / 0.180
G24     297.2          37.6                4.0 +/-    1.12       6.0 +/-    1.12  0.090 / 0.140
G28     100.0          36.6                4.0 +/-    0.87       6.2 +/-    0.87  0.040 / 0.040