PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-20:57:30
G02     199.8          17.9               16.6 +/-    2.61      38.4 +/-    2.61  0.080 / 0.170
G06     171.1          51.0               13.8 +/-    0.66      17.3 +/-    0.66  0.110 / 0.150
G13     229.8          15.3               16.6 +/-    2.01      40.9 +/-    2.01  0.040 / 0.050
G17     12.4           64.6               11.6 +/-    0.56      12.7 +/-    0.56  0.040 / 0.050
G19     306.1          70.8               11.3 +/-    0.61      11.9 +/-    0.61  0.110 / 0.110
G24     312.0          27.4                9.9 +/-    2.19      18.4 +/-    2.19  0.070 / 0.130
G28     84.3           41.4               11.8 +/-    1.73      16.8 +/-    1.73  0.040 / 0.090
G30     156.5          17.2               15.9 +/-    1.34      37.5 +/-    1.34  0.060 / 0.070