PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/18-23:57:50
G02     349.2          77.9                9.5 +/-    0.39       9.7 +/-    0.39  0.070 / 0.090
G05     162.8          35.1               14.7 +/-    1.48      23.3 +/-    1.48  0.070 / 0.080
G06     42.0           38.8                9.0 +/-    1.40      13.3 +/-    1.40  0.030 / 0.020
G12     309.7          72.6               10.2 +/-    0.61      10.6 +/-    0.61  0.030 / 0.020
G17     85.6           13.5               11.6 +/-    2.96      30.0 +/-    2.96  0.040 / 0.050
G19     75.0           28.1               10.8 +/-    1.50      19.7 +/-    1.50  0.070 / 0.050
G24     227.5          22.1               15.2 +/-    2.26      31.8 +/-    2.26  0.060 / 0.090
G25     317.2          28.9                9.5 +/-    1.31      17.0 +/-    1.31  0.060 / 0.070