PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-20:13:10
G01     300.3          37.0                8.4 +/-    1.94      12.8 +/-    1.94  0.090 / 0.120
G03     308.9          10.9              -13.4 +/-   27.21     -36.6 +/-   27.21  0.060 / 0.110
G10     112.8          35.5               11.0 +/-    1.31      17.4 +/-    1.31  0.030 / 0.030
G11     274.9          27.8                9.3 +/-    2.30      17.2 +/-    2.30  0.020 / 0.020
G14     11.1           63.3                9.3 +/-    0.56      10.3 +/-    0.56  0.080 / 0.170
G22     311.8          31.0               10.4 +/-    0.95      17.8 +/-    0.95  0.100 / 0.150
G25     74.9           18.2                9.7 +/-    1.81      22.3 +/-    1.81  0.030 / 0.040
G31     161.8          71.5               12.7 +/-    0.26      13.3 +/-    0.26  0.030 / 0.040
G32     42.7           48.1                8.6 +/-    1.37      11.1 +/-    1.37  0.050 / 0.030