PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-21:27:40
G10     289.2          49.0               10.8 +/-    1.06      13.7 +/-    1.06  0.070 / 0.120
G15     48.7           38.4                8.4 +/-    0.77      12.5 +/-    0.77  0.070 / 0.110
G20     337.9          65.3                8.3 +/-    0.71       9.0 +/-    0.71  0.040 / 0.040
G21     73.7           76.6               11.7 +/-    0.60      12.0 +/-    0.60  0.040 / 0.040
G24     101.0          23.9               10.3 +/-    1.64      20.6 +/-    1.64  0.080 / 0.160
G27     307.2          30.5                9.2 +/-    1.65      15.9 +/-    1.65  0.080 / 0.180
G29     168.6          13.4               13.0 +/-    3.47      33.5 +/-    3.47  0.040 / 0.060
G32     208.1          27.2               10.8 +/-    2.84      20.2 +/-    2.84  0.040 / 0.080