PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/16-21:13:10
G02     199.7          17.8               18.7 +/-    2.10      43.4 +/-    2.10  0.100 / 0.320
G06     171.3          50.7               15.4 +/-    0.88      19.3 +/-    0.88  0.090 / 0.190
G13     230.0          15.4               15.4 +/-    2.42      37.8 +/-    2.42  0.060 / 0.210
G17     11.8           64.9               12.0 +/-    0.94      13.1 +/-    0.94  0.080 / 0.220
G19     305.8          70.8               13.1 +/-    0.69      13.8 +/-    0.69  0.030 / 0.040
G24     312.1          27.2                9.2 +/-    2.29      17.2 +/-    2.29  0.040 / 0.040
G28     84.2           41.5               13.2 +/-    0.81      18.8 +/-    0.81  0.040 / 0.090
G30     156.4          17.2               17.5 +/-    1.48      41.2 +/-    1.48  0.040 / 0.090