PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-19:57:50
G10     244.9          22.0               10.6 +/-    1.38      22.3 +/-    1.38  0.040 / 0.060
G13     60.3           33.0                8.0 +/-    1.28      13.2 +/-    1.28  0.040 / 0.070
G15     111.2          58.8                8.3 +/-    0.62       9.6 +/-    0.62  0.130 / 0.650
G16     302.0          15.5                4.2 +/-    2.06      10.3 +/-    2.06  0.120 / 0.570
G20     261.0          46.1                8.5 +/-    1.06      11.3 +/-    1.06  0.060 / 0.120
G21     326.0          55.4                6.7 +/-    0.64       7.9 +/-    0.64  0.060 / 0.120
G26     274.4          18.0                7.4 +/-    1.15      17.1 +/-    1.15  0.030 / 0.050
G29     162.5          58.5               10.6 +/-    1.13      12.2 +/-    1.13  0.030 / 0.050