PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/20-19:28:00
G07     303.9          44.6                9.8 +/-    2.10      13.3 +/-    2.10  0.050 / 0.070
G08     134.9          37.9               12.9 +/-    0.75      19.4 +/-    0.75  0.050 / 0.060
G09     309.8          75.4               10.7 +/-    0.96      11.0 +/-    0.96  0.170 / 0.200
G16     41.8           26.0                8.7 +/-    3.60      16.6 +/-    3.60  0.130 / 0.190
G23     141.3          63.1               11.4 +/-    0.42      12.6 +/-    0.42  0.070 / 0.070
G27     81.4           37.0                9.3 +/-    1.06      14.3 +/-    1.06  0.040 / 0.070
G28     223.0          11.1               -1.2 +/-   22.01      -3.2 +/-   22.01  0.280 / 0.410
G30     285.2          23.1                8.3 +/-    1.77      17.0 +/-    1.77  0.210 / 0.340