PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-13:42:20
G02     210.9          46.8                6.9 +/-    0.67       9.0 +/-    0.67  0.060 / 0.060
G06     93.7           79.0                5.5 +/-    0.46       5.6 +/-    0.46  0.060 / 0.070
G12     316.0          30.8                5.2 +/-    0.88       9.0 +/-    0.88  0.110 / 0.090
G17     50.8           36.8                5.1 +/-    1.63       7.8 +/-    1.63  0.090 / 0.080
G19     20.5           58.3                6.5 +/-    1.66       7.5 +/-    1.66  0.030 / 0.020
G24     274.7          43.4                5.1 +/-    1.10       7.1 +/-    1.10  0.040 / 0.020
G28     115.7          21.2                7.1 +/-    1.78      15.1 +/-    1.78  0.060 / 0.040