PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-23:57:40
G02     4.3            73.7                9.5 +/-    0.32       9.8 +/-    0.32  0.020 / 0.020
G05     160.0          40.6               14.1 +/-    0.77      20.3 +/-    0.77  0.020 / 0.020
G06     43.7           33.8                8.4 +/-    2.10      13.6 +/-    2.10  0.040 / 0.060
G12     293.8          77.5               12.0 +/-    1.11      12.2 +/-    1.11  0.040 / 0.050
G17     90.1           10.1               12.2 +/-    2.30      33.9 +/-    2.30  0.120 / 0.160
G19     80.0           24.9               11.0 +/-    1.74      21.5 +/-    1.74  0.140 / 0.400
G24     223.4          18.2               16.1 +/-    2.81      37.1 +/-    2.81  0.080 / 0.090
G25     315.9          34.0                8.3 +/-    1.26      13.4 +/-    1.26  0.080 / 0.100
G29     290.4          11.7                7.2 +/-   22.04      19.3 +/-   22.04  0.060 / 0.050