PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-21:27:40
G10     286.7          48.0                8.4 +/-    2.50      10.9 +/-    2.50  0.040 / 0.040
G15     49.5           40.1                6.1 +/-    1.02       8.9 +/-    1.02  0.040 / 0.040
G20     333.4          65.1                8.0 +/-    0.40       8.7 +/-    0.40  0.070 / 0.110
G21     65.3           77.0                8.8 +/-    0.61       9.0 +/-    0.61  0.080 / 0.100
G24     102.9          23.1                8.5 +/-    1.14      17.3 +/-    1.14  0.080 / 0.150
G27     308.8          29.4                7.7 +/-    1.67      13.6 +/-    1.67  0.080 / 0.160
G29     168.6          15.2               11.5 +/-    1.78      28.5 +/-    1.78  0.060 / 0.100
G32     207.5          25.4               11.8 +/-    2.45      22.8 +/-    2.45  0.070 / 0.060