PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-21:28:00
G02     203.7          36.9               15.4 +/-    2.81      23.6 +/-    2.81  0.110 / 0.170
G06     153.7          71.7               14.3 +/-    0.88      14.9 +/-    0.88  0.110 / 0.140
G12     308.9          17.5               10.5 +/-    0.72      24.5 +/-    0.72  0.080 / 0.090
G17     35.1           50.2               11.6 +/-    0.91      14.6 +/-    0.91  0.060 / 0.100
G19     1.4            64.9               12.6 +/-    0.76      13.8 +/-    0.76  0.040 / 0.100
G24     295.5          39.2               12.0 +/-    0.55      17.6 +/-    0.55  0.050 / 0.090
G28     104.4          29.8               13.7 +/-    1.13      24.1 +/-    1.13  0.080 / 0.150