PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-21:57:40
G02     205.1          41.5               16.0 +/-    1.17      22.7 +/-    1.17  0.070 / 0.040
G06     142.8          75.5               13.7 +/-    0.75      14.1 +/-    0.75  0.050 / 0.040
G12     311.1          20.7                9.6 +/-    1.83      20.8 +/-    1.83  0.160 / 0.220
G17     39.0           47.3               10.7 +/-    1.72      13.9 +/-    1.72  0.220 / 0.250
G19     10.3           62.3               11.5 +/-    0.76      12.8 +/-    0.76  0.030 / 0.030
G24     290.4          40.8               13.3 +/-    7.27      19.1 +/-    7.27  0.030 / 0.030
G28     108.4          26.8               13.2 +/-    1.08      24.8 +/-    1.08  0.090 / 0.170