PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-11:58:10
G02     201.4          22.2                5.3 +/-    1.35      11.0 +/-    1.35  0.110 / 0.310
G06     166.8          58.3                7.5 +/-    1.09       8.6 +/-    1.09  0.070 / 0.270
G13     223.4          11.1                3.4 +/-    3.18       9.2 +/-    3.18  0.070 / 0.110
G17     22.9           58.8                5.4 +/-    0.35       6.1 +/-    0.35  0.070 / 0.100
G19     339.8          70.2                5.3 +/-    0.69       5.6 +/-    0.69  0.040 / 0.040
G24     308.0          30.8                5.8 +/-    1.27      10.1 +/-    1.27  0.030 / 0.040
G28     86.6           43.7                4.9 +/-    0.93       6.8 +/-    0.93  0.130 / 0.420
G30     158.0          12.7                5.3 +/-    1.74      13.8 +/-    1.74  0.130 / 0.450