PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-17:43:10
G02     230.8          70.2                8.9 +/-    0.66       9.4 +/-    0.66  0.040 / 0.140
G05     173.6          12.0                7.9 +/-   14.27      21.0 +/-   14.27  0.040 / 0.090
G06     42.3           62.9                7.0 +/-    0.44       7.7 +/-    0.44  0.110 / 0.110
G12     320.6          45.8                8.2 +/-    0.43      11.0 +/-    0.43  0.140 / 0.090
G17     65.0           27.6                6.3 +/-    1.63      11.7 +/-    1.63  0.260 / 0.550
G19     52.9           40.3                8.0 +/-    1.42      11.6 +/-    1.42  0.240 / 0.520
G24     251.1          37.1                9.7 +/-    1.64      14.8 +/-    1.64  0.050 / 0.030
G28     128.4          10.0               10.5 +/-    3.00      29.2 +/-    3.00  0.050 / 0.030