PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-21:12:30
G02     200.7          24.5               16.8 +/-    1.45      33.3 +/-    1.45  0.080 / 0.110
G06     167.9          58.5               14.8 +/-    1.09      17.0 +/-    1.09  0.090 / 0.110
G13     224.9          10.8               16.7 +/-    3.47      45.9 +/-    3.47  0.210 / 0.310
G17     21.6           59.4               12.9 +/-    0.37      14.7 +/-    0.37  0.210 / 0.430
G19     328.8          70.1               12.6 +/-    0.72      13.4 +/-    0.72  0.040 / 0.110
G24     307.4          32.2               10.3 +/-    1.02      17.2 +/-    1.02  0.050 / 0.100
G28     92.0           37.5               13.1 +/-    0.98      19.8 +/-    0.98  0.080 / 0.210
G30     157.3          10.9               17.2 +/-    5.13      47.2 +/-    5.13  0.090 / 0.200