PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/21-14:13:00
G02     203.7          30.1                9.7 +/-    1.89      17.0 +/-    1.89  0.100 / 0.090
G06     159.1          67.7                9.3 +/-    1.09      10.0 +/-    1.09  0.070 / 0.090
G12     305.9          13.8                6.1 +/-    1.90      15.7 +/-    1.90  0.090 / 0.250
G17     30.7           53.2                7.4 +/-    0.64       9.0 +/-    0.64  0.090 / 0.220
G19     1.4            65.6                7.2 +/-    0.56       7.8 +/-    0.56  0.050 / 0.110
G24     300.2          36.4                8.0 +/-    1.31      12.4 +/-    1.31  0.050 / 0.130
G28     97.0           38.0                8.0 +/-    1.16      12.0 +/-    1.16  0.040 / 0.040