PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/21-21:57:50
G10     268.6          40.4               11.1 +/-    1.58      16.0 +/-    1.58  0.040 / 0.050
G13     41.0           16.4                7.3 +/-    2.70      17.5 +/-    2.70  0.040 / 0.040
G15     58.3           48.4                8.9 +/-    1.37      11.4 +/-    1.37  0.220 / 0.340
G16     278.0          12.2                9.5 +/-    1.78      25.3 +/-    1.78  0.170 / 0.330
G20     300.6          60.9                8.5 +/-    0.64       9.6 +/-    0.64  0.030 / 0.050
G21     3.5            71.9                9.4 +/-    0.80       9.8 +/-    0.80  0.030 / 0.040
G24     120.8          14.7               10.1 +/-    1.61      25.3 +/-    1.61  0.180 / 0.450
G27     318.5          19.2                7.4 +/-    1.13      16.6 +/-    1.13  0.280 / 0.510
G29     167.2          30.3                9.4 +/-    2.37      16.4 +/-    2.37  0.060 / 0.060