PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-20:28:00
G10     256.4          31.5               11.3 +/-    2.68      19.2 +/-    2.68  0.040 / 0.050
G13     48.1           25.7                8.6 +/-    0.81      16.6 +/-    0.81  0.050 / 0.060
G15     81.6           59.0                8.7 +/-    0.48      10.0 +/-    0.48  0.120 / 0.440
G16     288.7          14.9                6.4 +/-    2.15      16.1 +/-    2.15  0.120 / 0.510
G20     279.1          54.8                8.7 +/-    0.62      10.4 +/-    0.62  0.060 / 0.190
G21     342.9          64.7                5.7 +/-    1.35       6.2 +/-    1.35  0.080 / 0.210
G26     261.7          12.8                8.3 +/-    2.23      21.7 +/-    2.23  0.020 / 0.040
G29     166.3          43.2                9.9 +/-    0.95      13.8 +/-    0.95  0.020 / 0.050