PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/22-22:28:00
G10     256.8          31.7                9.4 +/-    1.88      15.9 +/-    1.88  0.040 / 0.040
G13     47.8           25.4                8.1 +/-    2.53      15.7 +/-    2.53  0.040 / 0.040
G15     78.3           57.8                8.0 +/-    0.41       9.3 +/-    0.41  0.150 / 0.460
G16     287.0          15.2                4.8 +/-    1.87      11.9 +/-    1.87  0.120 / 0.450
G20     259.0          22.4                4.3 +/-    2.84       8.9 +/-    2.84  0.150 / 0.170
G21     341.2          64.3                8.1 +/-    0.47       8.9 +/-    0.47  0.130 / 0.160
G26     259.9          12.7                9.1 +/-    2.73      23.9 +/-    2.73  0.020 / 0.030
G29     166.8          43.5                9.1 +/-    1.02      12.5 +/-    1.02  0.030 / 0.030