PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/10/20-17:27:50
G10     257.3          33.6                8.6 +/-    1.81      14.0 +/-    1.81  0.230 / 0.230
G13     47.1           24.2                8.1 +/-    2.27      16.1 +/-    2.27  0.160 / 0.530
G15     70.8           54.0                7.3 +/-    0.65       8.9 +/-    0.65  0.160 / 0.690
G16     287.8          15.2                5.9 +/-    2.80      14.5 +/-    2.80  0.040 / 0.040
G20     283.1          56.8                8.4 +/-    2.44       9.9 +/-    2.44  0.040 / 0.030
G21     343.8          64.8                8.2 +/-    0.62       9.0 +/-    0.62  0.080 / 0.180
G26     261.6          12.5                8.6 +/-    1.36      22.7 +/-    1.36  0.070 / 0.160
G27     322.1          10.7              -12.3 +/-   22.88     -33.8 +/-   22.88  0.100 / 0.110
G29     165.7          43.0                9.3 +/-    0.85      12.8 +/-    0.85  0.080 / 0.090