PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-06:27:50
G07     318.8          52.9                3.6 +/-    0.61       4.4 +/-    0.61  0.040 / 0.050
G08     121.6          45.9                7.5 +/-    0.36       9.9 +/-    0.36  0.040 / 0.050
G09     238.6          83.6                3.8 +/-    0.50       3.8 +/-    0.50  0.050 / 0.050
G16     43.7           15.5                1.2 +/-    4.06       2.9 +/-    4.06  0.040 / 0.060
G23     149.6          53.2                6.8 +/-    0.69       8.3 +/-    0.69  0.030 / 0.020
G27     69.1           36.3                6.2 +/-    1.40       9.6 +/-    1.40  0.030 / 0.020
G28     227.6          12.8                5.0 +/-    7.76      13.1 +/-    7.76  0.040 / 0.050
G30     291.6          26.1                4.9 +/-    2.54       9.3 +/-    2.54  0.040 / 0.050