PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-21:13:00
G03     187.0          14.5               14.4 +/-    1.57      36.3 +/-    1.57  0.040 / 0.120
G07     295.5          40.2               11.5 +/-    0.81      16.7 +/-    0.81  0.050 / 0.120
G08     139.8          31.8               13.4 +/-    0.99      22.7 +/-    0.99  0.080 / 0.130
G09     318.4          67.2                9.6 +/-    0.80      10.3 +/-    0.80  0.070 / 0.090
G16     41.8           34.5                9.3 +/-    1.64      14.9 +/-    1.64  0.050 / 0.070
G23     130.4          72.9               12.1 +/-    0.74      12.6 +/-    0.74  0.050 / 0.070
G27     91.7           35.6               11.3 +/-    0.63      17.7 +/-    0.63  0.150 / 0.390
G30     279.4          19.3               10.5 +/-    1.51      23.5 +/-    1.51  0.240 / 0.290