PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/23-10:42:40
G10     254.3          29.2                4.3 +/-    2.61       7.6 +/-    2.61  0.090 / 0.250
G13     50.3           28.0                2.6 +/-    2.73       4.7 +/-    2.73  0.070 / 0.250
G15     75.7           55.1                6.3 +/-    0.73       7.6 +/-    0.73  0.040 / 0.030
G16     292.6          14.6                2.2 +/-    1.06       5.6 +/-    1.06  0.060 / 0.040
G20     41.2           50.6                5.2 +/-    0.57       6.5 +/-    0.57  0.070 / 0.040
G21     342.8          64.6                5.6 +/-    0.54       6.1 +/-    0.54  0.060 / 0.040
G26     263.8          13.8                3.1 +/-    1.52       7.9 +/-    1.52  0.100 / 0.180
G29     165.3          43.6                7.8 +/-    0.74      10.7 +/-    0.74  0.080 / 0.220